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9th Class Chemistry Notes - Chapter Wise MCQs & Short Questions MCQs Bank
Verified Question Bank for High-Performance Exam Preparation.
1
Chemistry primarily studies what?
A
Mathematics
B
Matter and its interactions with energy
✅
C
Philosophy
D
Literature
2
What occurs during a chemical reaction?
A
Atoms disappear
B
Molecules cease to exist
C
Bonds break and form
✅
D
Energy is destroyed
3
Which branch of chemistry studies carbon-containing compounds?
A
Biochemistry
B
Organic chemistry
✅
C
Physical chemistry
D
Inorganic chemistry
4
The study of chemical processes within living organisms is called?
A
Analytical chemistry
B
Physical chemistry
C
Biochemistry
✅
D
Organic chemistry
5
Which branch of chemistry is essential for drug formulation?
A
Nuclear chemistry
B
Environmental chemistry
C
Medicinal chemistry
✅
D
Geochemistry
6
What is the study of the chemical composition of Earth's crust?
A
Geochemistry
✅
B
Astrochemistry
C
Biochemistry
D
Physical chemistry
7
Which branch focuses on non-carbon-based compounds like metals?
A
Organic chemistry
B
Inorganic chemistry
✅
C
Analytical chemistry
D
Physical chemistry
8
The study of chemical reactions in space is called?
A
Geochemistry
B
Astrochemistry
✅
C
Nuclear chemistry
D
Biochemistry
9
What is the focus of Physical chemistry?
A
Biological studies
B
Matter-energy relationships
✅
C
Analysis of material
D
Compounds
10
Which branch determines the composition of substances?
A
Analytical chemistry
✅
B
Organic chemistry
C
Physical chemistry
D
Biochemistry
11
What is used in medical imaging like MRI and X-rays?
A
Organic chemistry
B
Inorganic chemistry
C
Nuclear chemistry
✅
D
Physical chemistry
12
Developing eco-friendly materials is the role of?
A
Biochemistry
B
Environmental chemistry
✅
C
Nuclear chemistry
D
Inorganic chemistry
13
Which process in cooking is a chemical reaction?
A
Weighing
B
Caramelization
✅
C
Cutting
D
Washing
14
Cleaning products contain chemicals that break down grease called?
A
Solvents
B
Surfactants
✅
C
Enzymes
D
Isotopes
15
Vaccine production involves which combination?
A
Science and Technology
✅
B
Art and History
C
Music and Sports
D
Literature and Law
16
Designing efficient photovoltaic cells for solar panels is?
A
Science
B
Technology
✅
C
Engineering
D
Mathematics
17
The use of Carbon-14 to date ancient artifacts is part of?
A
Nuclear chemistry
✅
B
Organic chemistry
C
Inorganic chemistry
D
Physical chemistry
18
Which branch explains the behavior of reaction rates?
A
Biochemistry
B
Analytical chemistry
C
Physical chemistry
✅
D
Inorganic chemistry
19
Creating practical systems for energy storage is?
A
Science
B
Technology
C
Engineering
✅
D
Philosophy
20
Pollutant analysis in air and water is studied in?
A
Environmental chemistry
✅
B
Geochemistry
C
Nuclear chemistry
D
Organic chemistry
21
The study of Earth's rocks and minerals is?
A
Geochemistry
✅
B
Biochemistry
C
Physical chemistry
D
Astrochemistry
22
What helps a doctor understand drug interactions in the body?
A
History
B
Chemistry
✅
C
Geography
D
Physics
23
Designing biodegradable plastics is an application of?
A
Organic chemistry
✅
B
Inorganic chemistry
C
Physical chemistry
D
Geochemistry
24
Which branch is vital for producing cement and fertilizers?
A
Biochemistry
B
Inorganic chemistry
✅
C
Organic chemistry
D
Nuclear chemistry
25
What is the primary study of matter's properties?
A
Physics
B
Chemistry
✅
C
Biology
D
Geology
26
A tree showing different branches of chemistry is a?
A
Map
B
Diagram
✅
C
Theory
D
Law
27
Which field deals with chemical cycles like Carbon and Nitrogen?
A
Physical chemistry
B
Environmental science
✅
C
Nuclear chemistry
D
Geochemistry
28
Spectroscopy and nanotechnology are tools used in?
A
Ancient history
B
Technological innovation
✅
C
Basic math
D
Sports
29
The photoelectric effect is a concept of?
A
Science
✅
B
Technology
C
Engineering
D
Literature
30
Designing catalytic converters to reduce emissions uses?
A
Nuclear chemistry
B
Environmental chemistry
✅
C
Geochemistry
D
Astrochemistry
31
Which state of matter has a definite shape and volume?
A
Liquid
B
Solid
✅
C
Gas
D
Plasma
32
Changing from liquid to gas is called?
A
Freezing
B
Evaporation
✅
C
Melting
D
Condensation
33
Which state has particles that are far apart and move freely?
A
Solid
B
Liquid
C
Gas
✅
D
Plasma
34
Ionized gas with free electrons and ions is called?
A
Solid
B
Liquid
C
Gas
D
Plasma
✅
35
A pure substance made of only one type of atom is a/an?
A
Mixture
B
Compound
C
Element
✅
D
Solution
36
Which is an example of a compound?
A
Gold
B
Water
✅
C
Oxygen
D
Helium
37
A physical combination of two or more substances is a?
A
Element
B
Compound
C
Mixture
✅
D
Solution
38
The smallest unit of an element is a/an?
A
Molecule
✅
B
Atom
C
Ion
D
Compound
39
Different structural forms of the same element are?
A
Isotopes
B
Allotropes
✅
C
Isomers
D
Polymers
40
Which is an allotrope of carbon?
A
Water
B
Salt
C
Diamond
✅
D
Sand
41
Graphite and Diamond differ in their?
A
Atomic mass
B
Chemical formula
C
Atomic arrangement
✅
D
Atomic number
42
A homogeneous mixture is also known as a?
A
Suspension
B
Colloid
C
Solution
✅
D
Element
43
In a saltwater solution
A
salt is the?
B
Solvent
C
Solute
✅
D
Mixture
44
A solution that can dissolve no more solute is?
A
Dilute
B
Concentrated
C
Saturated
✅
D
Unsaturated
45
Tiny fat globules dispersed in milk make it a?
A
Solution
B
Colloid
✅
C
Suspension
D
Compound
46
Scattering of light by colloidal particles is called?
A
Tyndall effect
✅
B
Photoelectric effect
C
Greenhouse effect
D
Doppler effect
47
Which mixture settles over time?
A
Solution
B
Colloid
C
Suspension
✅
D
Element
48
Fog is an example of a?
A
Solution
B
Suspension
C
Colloid
✅
D
Compound
49
What is the formula of Carbon dioxide?
A
CO
B
CO2
✅
C
C2O
D
CO3
50
Compounds require what kind of methods to separate?
A
Physical
B
Chemical
✅
C
Mechanical
D
Manual
51
Air is a mixture of?
A
Elements
B
Gases
✅
C
Compounds
D
Solids
52
The solvent in a soda drink is usually?
A
Carbon dioxide
B
Sugar
C
Water
✅
D
Caffeine
53
An example of a solid dissolved in a liquid is?
A
Oxygen in water
B
Salt in water
✅
C
Oil in water
D
Sand in water
54
Diamond's hardness is due to its?
A
2D structure
B
3D tetrahedral structure
✅
C
Layered structure
D
Spherical structure
55
Which allotrope of carbon is used in pencils?
A
Diamond
B
Graphite
✅
C
Fullerenes
D
Graphene
56
Particles in a suspension are?
A
Very small
B
Invisible
C
Large and heavy
✅
D
Atomic size
57
The state of matter in stars is primarily?
A
Solid
B
Liquid
C
Gas
D
Plasma
✅
58
Converting solid directly into gas is called?
A
Melting
B
Sublimation
C
Freezing
✅
D
Evaporation
59
Muddy water is an example of a?
A
Solution
B
Colloid
C
Suspension
✅
D
Compound
60
The substance in which a solute dissolves is the?
A
Solute
B
Solvent
✅
C
Mixture
D
Alloy
61
The main energy level of electrons is represented by?
A
Sub-shell
B
Shell
✅
C
Orbital
D
Nucleus
62
Subdivisions within a shell (s
A
p
B
d
C
f) are?
D
Shells
63
An atom is electrically neutral because?
A
Protons equal Neutrons
B
Protons equal Electrons
✅
C
Neutrons equal Electrons
D
It has no charge
64
How many sub-shells are in the N shell?
A
1
B
2
C
3
D
4
✅
65
Notation for the sub-shells of the M shell starts with?
A
1
B
2
C
3
✅
D
4
66
The atomic number represents the number of?
A
Neutrons
B
Protons
✅
C
Quarks
D
Positrons
67
Which principle states electrons fill lower energy orbitals first?
A
Hund's Rule
B
Aufbau Principle
✅
C
Octet Rule
D
Duplet Rule
68
The 2s orbital is lower in energy than?
A
1s
B
2s
C
2p
✅
D
1p
69
Bohr's model shows electrons move in?
A
Clouds
B
Fixed orbits
✅
C
Random paths
D
Waves
70
Potassium (Atomic No. 19) has how many electrons in the N shell?
A
8
B
2
C
1
✅
D
18
71
Atoms of the same element with different neutrons are?
A
Allotropes
B
Isotopes
✅
C
Isomers
D
Ions
72
Which isotope is used in cancer treatment?
A
Carbon-14
B
Cobalt-60
✅
C
Iodine-131
D
Uranium-235
73
Radiocarbon dating uses which isotope?
A
Carbon-12
B
Carbon-13
C
Carbon-14
✅
D
Uranium-238
74
The mass number is the sum of?
A
Protons and Electrons
B
Protons and Neutrons
✅
C
Neutrons and Electrons
D
Protons only
75
Who discovered the electron?
A
J.J. Thomson
✅
B
Ernest Rutherford
C
John Dalton
D
Niels Bohr
76
The dense
A
positive center of an atom is the?
B
Electron
C
Proton
D
Nucleus
77
Which subatomic particle has no charge?
A
Proton
B
Electron
C
Neutron
✅
D
Positron
78
The weighted average mass of isotopes is?
A
Atomic number
B
Relative atomic mass
✅
C
Mass number
D
Formula mass
79
The atomic mass unit (amu) is based on?
A
Hydrogen-1
B
Oxygen-16
C
Carbon-12
✅
D
Nitrogen-14
80
Cations are formed when an atom?
A
Gains electrons
B
Loses electrons
✅
C
Gains protons
D
Loses neutrons
81
Anions are formed when an atom?
A
Gains electrons
✅
B
Loses electrons
C
Gains protons
D
Loses neutrons
82
The electronic configuration of Carbon (Atomic No. 6) is?
A
1s2 2s2 2p2
✅
B
1s2 2s2 2p4
C
1s2 2s2 2p6
D
1s2 2s1
83
How many electrons can the p sub-shell hold?
A
2
B
6
✅
C
10
D
14
84
The first subatomic particle discovered was?
A
Proton
B
Neutron
C
Electron
✅
D
Quark
85
Who proposed that atoms are indivisible particles?
A
Dalton
B
Rutherford
✅
C
Thomson
D
Bohr
86
Spectral lines of multi-electron atoms could not be explained by?
A
Quantum model
B
Bohr model
✅
C
Dalton model
D
Thomson model
87
Modern model describes electrons in regions called?
A
Orbits
B
Orbitals
✅
C
Shells
D
Rings
88
Chlorine-35 and Chlorine-37 are examples of?
A
Allotropes
B
Isotopes
✅
C
Compounds
D
Ions
89
Valence electrons are found in the?
A
Inner shell
B
Outermost shell
✅
C
Nucleus
D
d-orbital
90
Which isotope is used as fuel in nuclear reactors?
A
Cobalt-60
B
Iodine-131
C
Uranium-235
✅
D
Carbon-14
91
The charge of a proton is?
A
-1
B
0
C
+1
✅
D
+2
92
Who developed the first periodic table?
A
Dalton
B
Mendeleev
C
Rutherford
✅
D
Thomson
93
Groups in the periodic table are?
A
Horizontal rows
B
Vertical columns
✅
C
Diagonal lines
D
Circular rings
94
Periods in the periodic table represent the number of?
A
Valence electrons
B
Protons
C
Electron shells
✅
D
Neutrons
95
Group 1 elements are known as?
A
Alkaline earth metals
B
Halogens
C
Noble gases
D
Alkali metals
✅
96
Halogens belong to which group?
A
Group 1
B
Group 2
C
Group 17
✅
D
Group 18
97
Which group contains the noble gases?
A
Group 1
B
Group 17
C
Group 18
✅
D
Group 2
98
Atomic radius across a period (left to right)?
A
Increases
B
Decreases
✅
C
Stays same
D
Doubles
99
The energy required to remove an electron is?
A
Electron affinity
B
Ionization energy
✅
C
Electronegativity
D
Bond energy
100
The ability of an atom to attract shared electrons is?
A
Ionization energy
B
Electronegativity
✅
C
Electron affinity
D
Valency
101
Metallic character down a group?
A
Increases
✅
B
Decreases
C
Stays same
D
Disappears
102
Which element is the most electronegative?
A
Oxygen
B
Fluorine
✅
C
Chlorine
D
Nitrogen
103
Transition metals are found in which block?
A
s-block
B
p-block
C
d-block
✅
D
f-block
104
Lanthanides and Actinides belong to which block?
A
s-block
B
p-block
C
d-block
D
f-block
✅
105
Group 1 elements form ions with charge?
A
-1
B
+1
✅
C
+2
D
0
106
Noble gases are unreactive because they have?
A
No electrons
B
Full outer shell
✅
C
High mass
D
Many neutrons
107
The distance from nucleus to outermost electron is?
A
Atomic number
B
Atomic radius
✅
C
Mass number
D
Valency
108
Elements with atomic numbers 57 to 71 are?
A
Actinides
B
Halogens
C
Lanthanides
✅
D
Noble gases
109
Which halogen is the most reactive?
A
Iodine
B
Bromine
C
Chlorine
D
Fluorine
✅
110
Helium is used in balloons because it is?
A
Flammable
B
Lighter than air
✅
C
Reactive
D
Heavy
111
Metals are good conductors because they have?
A
Fixed electrons
B
Free-moving electrons
✅
C
No electrons
D
Protons
112
Non-metals are generally?
A
Shiny
B
Malleable
C
Brittle
✅
D
Ductile
113
Elements in the same group have the same number of?
A
Shells
B
Valence electrons
✅
C
Protons
D
Neutrons
114
The d-block elements are also called?
A
Main group elements
B
Transition elements
✅
C
Halogens
D
Alkali metals
115
Electron affinity across a period?
A
Increases
✅
B
Decreases
C
Stays same
D
Decreases then increases
116
Which metal is the most malleable?
A
Iron
B
Gold
✅
C
Copper
D
Platinum
117
The +2 charge is characteristic of which group?
A
Group 1
B
Group 2
✅
C
Group 17
D
Group 18
118
Elements that show properties of both metals and non-metals are?
A
Halogens
B
Metalloids
✅
C
Alkali metals
D
Noble gases
119
Atomic radius down a group?
A
Increases
✅
B
Decreases
C
Stays same
D
First increases then decreases
120
Which block contains Groups 1 and 2?
A
s-block
✅
B
p-block
C
d-block
D
f-block
121
Modern periodic table is arranged by increasing?
A
Atomic mass
B
Atomic number
✅
C
Neutron number
D
Valency
122
The vertical columns 3 to 12 contain?
A
Alkali metals
B
Transition metals
✅
C
Noble gases
D
Halogens
123
Which element has the highest ionization energy?
A
Francium
B
Helium
✅
C
Lithium
D
Fluorine
124
Atoms react to achieve how many electrons in their valence shell?
A
2
B
4
C
6
D
8
✅
125
The tendency to achieve 8 electrons is called?
A
Duplet rule
B
Octet rule
✅
C
Aufbau principle
D
Hund's rule
126
Ionic bonds involve the?
A
Sharing of electrons
B
Transfer of electrons
✅
C
Sea of protons
D
Neutrons
127
Covalent bonds involve the?
A
Sharing of electrons
✅
B
Transfer of electrons
C
Loss of protons
D
Magnetic force
128
Bond formed between a metal and a non-metal is usually?
A
Covalent
B
Ionic
✅
C
Metallic
D
Hydrogen
129
Which molecule contains a triple covalent bond?
A
H2
B
O2
C
N2
✅
D
HCl
130
Water (H2O) has which type of bonding?
A
Ionic
B
Covalent
✅
C
Metallic
D
None
131
The attraction between metal cations and a sea of electrons is?
A
Ionic bond
B
Covalent bond
C
Metallic bond
✅
D
Hydrogen bond
132
Which bond is the strongest?
A
Ionic
B
Covalent
✅
C
Metallic
D
Van der Waals
133
Weak forces of attraction between molecules are?
A
Ionic bonds
B
Intermolecular forces
✅
C
Nuclear forces
D
Covalent bonds
134
Strongest intermolecular force involving Hydrogen is?
A
London forces
B
Dipole-dipole
C
Hydrogen bonding
✅
D
Covalent bond
135
Molecules that have unequal sharing of electrons are?
A
Non-polar
B
Polar
✅
C
Ionic
D
Inert
136
Which property is unique to metals?
A
Brittleness
B
Malleability
✅
C
Low boiling point
D
Insulator
137
Ionic compounds conduct electricity in?
A
Solid state
B
Molten or aqueous state
✅
C
Any state
D
Never
138
The energy required to break a chemical bond is?
A
Activation energy
B
Bond energy
✅
C
Lattice energy
D
Kinetic energy
139
Which molecule exhibits hydrogen bonding?
A
CH4
B
CO2
C
H2O
✅
D
NaCl
140
In a double covalent bond
A
how many electron pairs are shared?
B
1
C
2
D
3
141
Which compound is an example of an ionic bond?
A
HCl
B
CO2
C
NaCl
✅
D
CH4
142
Hydrogen bonding occurs between Hydrogen and?
A
Carbon
B
Oxygen
✅
C
Sodium
D
Iron
143
Metallic bonds allow metals to be?
A
Brittle
B
Ductile
✅
C
Soft
D
Transparent
144
Intermolecular forces affect a substance's?
A
Atomic number
B
Boiling point
✅
C
Valency
D
Radioactivity
145
Non-polar molecules are held by?
A
Hydrogen bonds
✅
B
London dispersion forces
C
Ionic bonds
D
Metallic bonds
146
The bond between two identical non-metal atoms is?
A
Polar
B
Non-polar
✅
C
Ionic
D
Metallic
147
Which type of bond holds DNA strands together?
A
Ionic
B
Covalent
C
Hydrogen
✅
D
Metallic
148
Electronegativity difference determines?
A
Bond type
✅
B
Atomic mass
C
Number of shells
D
Number of neutrons
149
Metals reflect light due to?
A
Protons
B
Free electrons
✅
C
Fixed nucleus
D
Neutrons
150
Ionic compounds generally have?
A
Low melting points
B
High melting points
✅
C
No melting points
D
Liquid state at RT
151
Single covalent bonds share how many electrons total?
A
1
B
2
✅
C
3
D
4
152
A bond formed by delocalized electrons is?
A
Covalent
B
Ionic
C
Metallic
✅
D
Polar
153
Water has a high boiling point due to?
A
Ionic bonds
B
Hydrogen bonding
✅
C
Small size
D
Triple bonds
154
Which molecule is non-polar?
A
H2O
B
HCl
C
O2
✅
D
NH3
155
Copper is used in wiring due to its?
A
Low cost
B
High electrical conductivity
✅
C
Color
D
Brittleness
156
The simplest whole-number ratio of atoms in a compound is?
A
Molecular formula
B
Empirical formula
✅
C
Structural formula
D
Chemical formula
157
The actual number of atoms in a molecule is the?
A
Empirical formula
B
Molecular formula
✅
C
Structural formula
D
Atomic ratio
158
The empirical formula of Glucose (C6H12O6) is?
A
C6H12O6
B
CHO
C
CH2O
✅
D
C3H6O3
159
Molecular mass is the sum of atomic masses in a?
A
Molecule
✅
B
Ionic lattice
C
Atom
D
Proton
160
The term "formula mass" is used for?
A
Covalent compounds
B
Ionic compounds
✅
C
Elements
D
Gases
161
Molecular mass of Water (H2O) is?
A
16 u
B
18 u
✅
C
20 u
D
10 u
162
Avogadro's number is equal to?
A
3.14 x 10^23
B
6.022 x 10^23
✅
C
9.81 x 10^23
D
1.66 x 10^23
163
One mole of any substance contains how many particles?
A
1 x 10^23
B
6.022 x 10^23
✅
C
12
D
100
164
Molar mass of CO2 is?
A
28 g/mol
B
44 g/mol
✅
C
32 g/mol
D
18 g/mol
165
Formula to calculate moles is?
A
Mass x Molar Mass
B
Mass / Molar Mass
✅
C
Mass + Molar Mass
D
Molar Mass / Mass
166
How many moles are in 36 g of water?
A
1
B
2
✅
C
3
D
4
167
Percentage composition represents?
A
Volume of gas
B
Percentage by mass of each element
✅
C
Number of protons
D
Bond strength
168
Chemical equations must be balanced to obey?
A
Law of Gravity
B
Law of Conservation of Mass
✅
C
Octet Rule
D
Hund's Rule
169
In the reaction 2H2 + O2 -> 2H2O
A
the coefficient of H2 is?
B
1
C
2
D
3
170
The molecular formula of Ethane is?
A
CH4
B
C2H6
✅
C
C2H4
D
C3H8
171
A formula showing the arrangement of atoms is?
A
Empirical
B
Molecular
C
Structural
✅
D
Atomic
172
Combustion of methane produces?
A
Oxygen and Water
B
CO2 and Water
✅
C
Nitrogen and CO2
D
Hydrogen
173
The number of atoms in 23 g of Sodium (Na) is?
A
1
B
6.022 x 10^23
✅
C
12 x 10^23
D
23
174
Mass of 1 mole of Hydrogen atoms is?
A
1 g
✅
B
2 g
C
16 g
D
4 g
175
Mass of 1 mole of Hydrogen molecules (H2) is?
A
1 g
B
2 g
✅
C
16 g
D
4 g
176
What is the formula mass of NaCl?
A
23 u
B
35.5 u
C
58.5 u
✅
D
100 u
177
One mole of Carbon-12 weighs exactly?
A
6 g
B
12 g
✅
C
1 g
D
24 g
178
The ratio of atoms in the empirical formula is always?
A
Decimal
B
Whole-number
✅
C
Negative
D
Fraction
179
Benzene (C6H6) has the empirical formula?
A
CH
✅
B
CH2
C
C2H2
D
C6H6
180
Calculating the mass of each element in a compound is?
A
Balancing
B
Stoichiometry
C
Percentage composition
✅
D
Oxidation
181
Binary ionic compounds consist of?
A
Two metals
B
Two non-metals
C
One metal and one non-metal
✅
D
Noble gases
182
Naming rule for binary ionic compounds ends the non-metal with?
A
-ous
B
-ic
C
-ide
✅
D
-ate
183
Molar mass of MgO is?
A
24 g/mol
B
16 g/mol
C
40 g/mol
✅
D
56 g/mol
184
Avogadro's number relates the microscopic scale to?
A
Meters
B
Grams
✅
C
Seconds
D
Amperes
185
The unit of atomic mass (u) is also called?
A
kg
B
amu
✅
C
mol
D
g
186
Loss of electrons is called?
A
Reduction
B
Oxidation
✅
C
Neutralization
D
Combustion
187
Gain of electrons is called?
A
Oxidation
B
Reduction
✅
C
Hydration
D
Sublimation
188
The apparent charge of an atom in a compound is its?
A
Valency
B
Atomic number
C
Oxidation state
✅
D
Mass number
189
Reducing agent is a substance that?
A
Gains electrons
B
Loses electrons
✅
C
Gains protons
D
Remains unchanged
190
Oxidizing agent is a substance that?
A
Gains electrons
✅
B
Loses electrons
C
Loses protons
D
Releases energy
191
In a neutral compound
A
the sum of oxidation states is?
B
+1
C
-1
D
0
192
The oxidation state of free elements (like O2) is?
A
-2
B
+1
C
0
✅
D
-1
193
The oxidation state of Oxygen in most compounds is?
A
-1
B
-2
✅
C
0
D
+2
194
In peroxides
A
the oxidation state of Oxygen is?
B
-2
C
-1
D
0
195
The oxidation state of Hydrogen in metal hydrides (like NaH) is?
A
+1
B
0
C
-1
✅
D
+2
196
Rusting of iron is which type of reaction?
A
Displacement
B
Neutralization
C
Redox
✅
D
Decomposition
197
Corrosion is the gradual deterioration of metals due to?
A
Reduction
B
Oxidation
✅
C
Heating
D
Cooling
198
Coating iron with zinc to prevent rust is?
A
Galvanization
B
Electroplating
✅
C
Alloying
D
Painting
199
A sacrificial anode is usually made of?
A
Gold
B
Silver
C
Zinc
✅
D
Copper
200
In the reaction CuO + H2 -> Cu + H2O
A
the reducing agent is?
B
CuO
C
H2
D
Cu
201
Oxidation number of Chromium in H2CrO4 is?
A
+4
B
+5
C
+6
✅
D
+3
202
Food cans are often plated with which metal?
A
Zinc
B
Tin
✅
C
Lead
D
Silver
203
The black layer on tarnished silver is?
A
Silver oxide
B
Silver sulfide
✅
C
Silver chloride
D
Pure silver
204
Copper forms a green layer called?
A
Rust
B
Patina
✅
C
Slag
D
Alloy
205
Corrosion requires both moisture and?
A
Nitrogen
B
Hydrogen
C
Oxygen
✅
D
Helium
206
Stainless steel is an alloy of Iron and?
A
Zinc
B
Magnesium
C
Chromium
✅
D
Sodium
207
The oxidation state of Nitrogen in NH3 is?
A
+3
B
-3
✅
C
0
D
+5
208
The sum of oxidation states in a polyatomic ion equals?
A
Zero
B
The ion's charge
✅
C
+1
D
-1
209
An oxidizing agent itself gets?
A
Oxidized
B
Reduced
✅
C
Neutralized
D
Vaporized
210
During reduction
A
the oxidation number?
B
Increases
✅
C
Decreases
D
Stays same
211
During oxidation
A
the oxidation number?
B
Increases
✅
C
Decreases
D
Stays same
212
Which is an example of an oxidizing agent?
A
Na
B
Mg
C
O2
✅
D
H2
213
Electrochemical processes in batteries are based on?
A
Acid-base
B
Redox
✅
C
Physical change
D
Nuclear
214
Oxidation state of Sulfur in H2SO4 is?
A
+4
B
+6
✅
C
-2
D
0
215
Hydrated iron(III) oxide is commonly known as?
A
Salt
B
Rust
✅
C
Lime
D
Potash
216
Oxidation state of Fluorine in compounds is always?
A
+1
B
0
C
-1
✅
D
-2
217
A reaction that releases heat energy is?
A
Endothermic
B
Exothermic
✅
C
Isothermal
D
Nuclear
218
A reaction that absorbs heat energy is?
A
Endothermic
✅
B
Exothermic
C
Combustion
D
Redox
219
The heat change at constant pressure is?
A
Entropy
B
Enthalpy
✅
C
Temperature
D
Power
220
Energy is released when chemical bonds are?
A
Broken
B
Formed
✅
C
Stretched
D
Weakened
221
Energy is absorbed when chemical bonds are?
A
Broken
B
Formed
✅
C
Balanced
D
Frozen
222
Which is an example of an exothermic reaction?
A
Photosynthesis
B
Combustion of methane
✅
C
Melting of ice
D
Boiling water
223
Which is an example of an endothermic reaction?
A
Burning wood
B
Photosynthesis
✅
C
Freezing water
D
Rusting iron
224
Standard unit of enthalpy is?
A
Joules
B
Kilojoules per mole
✅
C
Watts
D
Calories
225
A negative delta H (-ΔH) indicates?
A
Endothermic
B
Exothermic
✅
C
Equilibrium
D
No reaction
226
A positive delta H (+ΔH) indicates?
A
Endothermic
✅
B
Exothermic
C
Fast reaction
D
Combustion
227
The minimum energy required to start a reaction is?
A
Bond energy
B
Activation energy
✅
C
Potential energy
D
Solar energy
228
A substance that speeds up a reaction without being consumed is?
A
Reactant
B
Product
C
Catalyst
✅
D
Solvent
229
Biological catalysts are called?
A
Inhibitors
B
Enzymes
C
Isotopes
✅
D
Radicals
230
A catalyst works by?
A
Increasing energy
B
Lowering activation energy
✅
C
Absorbing heat
D
Changing products
231
Standard enthalpy change is measured at?
A
0 K
B
298 K
✅
C
500 K
D
100 K
232
The peak of an energy pathway diagram represents?
A
Reactants
B
Products
C
Activation energy barrier
✅
D
Enthalpy
233
Respiration is which type of reaction?
A
Endothermic
B
Exothermic
✅
C
Physical
D
Nuclear
234
Photospiration produces energy in the form of?
A
DNA
B
ATP
✅
C
RNA
D
Glucose
235
Respiration without oxygen is called?
A
Aerobic
B
Anaerobic
✅
C
Combustion
D
Photosynthesis
236
Bond energy is measured in?
A
m/s
B
kJ/mol
✅
C
kg
D
Liters
237
Triple bonds have bond energy compared to single bonds?
A
Lower
B
Higher
✅
C
Same
D
Zero
238
The process of breaking a specific bond is?
A
Bond dissociation
✅
B
Bond formation
C
Melting
D
Mixing
239
What happens to a catalyst after the reaction?
A
Consumed
B
Remains unchanged
✅
C
Evaporates
D
Becomes solid
240
Catalysts do not affect the reaction's?
A
Speed
B
Rate
C
Equilibrium position
✅
D
Activation energy
241
Which reaction involves positive ΔH?
A
Combustion
B
Freezing
C
Melting of ice
✅
D
Neutralization
242
Activation energy determines the reaction's?
A
Color
B
Yield
C
Rate/Speed
✅
D
Mass
243
Respiration provides energy for cellular?
A
Movement
B
Growth
C
Repair
D
All of these
✅
244
Enthalpy of reaction is ΔH = (Bond energy of reactants) - (?)
A
Bond energy of products
✅
B
Mass of products
C
Volume
D
Time
245
If ΔH is negative
A
the reaction feels?
B
Cold
C
Hot
D
Neutral
✅
246
Enzymes are made of?
A
Fats
B
Proteins
✅
C
Sugars
D
Minerals
247
Lowering activation energy makes a reaction?
A
Slower
B
Faster
✅
C
Stop
D
Reverse
248
A reaction that proceeds in both directions is?
A
Irreversible
B
Reversible
✅
C
Static
D
Final
249
Dynamic equilibrium occurs when?
A
Forward reaction stops
B
Reverse reaction stops
C
Rates of both reactions are equal
✅
D
Reactants are finished
250
For equilibrium to occur
A
the system must be?
B
Open
C
Closed
D
Large
251
What remains constant at equilibrium?
A
Temperature only
B
Concentration of reactants and products
✅
C
Volume only
D
Color only
252
Le Chatelier's Principle explains how a system responds to?
A
Gravity
B
Disturbances/Changes
✅
C
Sunlight
D
Sound
253
If concentration of reactants increases
A
equilibrium shifts?
B
Left
C
Right
D
Up
✅
254
In an exothermic reaction
A
increasing temperature shifts equilibrium?
B
Toward products
C
Toward reactants
D
No change
255
Increasing pressure in a gaseous system favors the side with?
A
More molecules
B
Fewer gas molecules
✅
C
No molecules
D
Higher mass
256
The ratio of products to reactants at equilibrium is the?
A
Rate constant
B
Equilibrium constant (K)
✅
C
Atomic ratio
D
Avogadro number
257
A large value of K indicates?
A
Reactants are favored
B
Products are favored
✅
C
Slow reaction
D
No reaction
258
A small value of K indicates?
A
Reactants are favored
✅
B
Products are favored
C
Fast reaction
D
Equilibrium
259
Equilibrium constant K changes with?
A
Pressure
B
Concentration
C
Temperature
✅
D
Catalyst
260
Adding a catalyst to an equilibrium system?
A
Shifts it right
B
Shifts it left
C
Speeds up both rates equally
✅
D
Increases K
261
Removing a product from a reversible reaction shifts it?
A
Toward reactants
B
Toward products
✅
C
No change
D
Stops it
262
Unit of Kc for the reaction H2 + I2 <-> 2HI is?
A
mol/L
B
L/mol
C
No unit
✅
D
atm
263
Expression for K is?
A
[Reactants]/[Products]
B
[Products]/[Reactants]
✅
C
[Products]+[Reactants]
D
[Products]-[Reactants]
264
Haber process is used to synthesize?
A
Oxygen
B
Ammonia
✅
C
Sulfuric acid
D
Methane
265
Equilibrium is a state?
A
Static
B
Dynamic
✅
C
Irreversible
D
Permanent
266
In Kp
A
'p' stands for?
B
Proton
C
Pressure
D
Power
267
Thermal decomposition of Calcium carbonate is?
A
Irreversible
B
Reversible
✅
C
Fast
D
Redox
268
If temperature increases in an endothermic reaction
A
K?
B
Decreases
✅
C
Increases
D
Stays same
269
Small K means equilibrium lies to the?
A
Right
B
Left
✅
C
Middle
D
Top
270
Le Chatelier's Principle helps optimize?
A
Industrial processes
✅
B
Reading speed
C
Cooking time
D
Weight loss
271
Catalyst does not change the?
A
Speed of reaction
B
Activation energy
C
Equilibrium position
✅
D
Reaction path
272
If gas molecules are equal on both sides
A
pressure change?
B
Shifts left
C
Shifts right
D
Has no effect
273
Haber process reaction is?
A
Exothermic
✅
B
Endothermic
C
Physical
D
Nuclear
274
Reaction: N2 + 3H2 <-> 2NH3. If pressure increases
A
NH3 yield?
B
Decreases
C
Increases
D
Stays same
275
Acids release which ions in water?
A
OH-
B
H+
✅
C
Na+
D
Cl-
276
Bases release which ions in water?
A
H+
B
OH-
✅
C
K+
D
Mg2+
277
The pH scale measures?
A
Density
B
Acidity or Basicity
✅
C
Mass
D
Volume
278
A pH less than 7 indicates a/an?
A
Base
B
Neutral solution
C
Acid
✅
D
Gas
279
A pH of 7 indicates?
A
Strong acid
B
Strong base
C
Neutrality
✅
D
Salt
280
A pH greater than 7 indicates a/an?
A
Acid
B
Neutral solution
C
Base
✅
D
Metal
281
Acids taste?
A
Sweet
B
Sour
✅
C
Bitter
D
Salty
282
Bases taste?
A
Sour
B
Bitter
✅
C
Sweet
D
Salty
283
Acids turn blue litmus paper?
A
Green
B
Red
✅
C
Yellow
D
Blue
284
Bases turn red litmus paper?
A
Red
B
Blue
✅
C
Green
D
Yellow
285
Reaction between an acid and a base is called?
A
Oxidation
B
Reduction
C
Neutralization
✅
D
Sublimation
286
Neutralization produces water and a?
A
Gas
B
Base
C
Salt
✅
D
Metal
287
Strong acids ionize?
A
Partially
B
Completely
✅
C
Not at all
D
Only when heated
288
An example of a strong acid is?
A
Acetic acid
B
Hydrochloric acid (HCl)
✅
C
Citric acid
D
Formic acid
289
Acetic acid is a?
A
Strong acid
B
Weak acid
✅
C
Strong base
D
Weak base
290
Bases feel?
A
Rough
B
Slippery
✅
C
Hot
D
Dry
291
Strong bases like NaOH dissociate?
A
Completely
✅
B
Partially
C
Not at all
D
Slowly
292
The pH of a strong base is?
A
1
B
5
C
7
D
14
✅
293
Acid used in car batteries is?
A
Nitric acid
B
Sulfuric acid
C
Hydrochloric acid
D
Acetic acid
✅
294
Acids react with metals to release?
A
Oxygen gas
B
Hydrogen gas
✅
C
CO2 gas
D
Nitrogen gas
295
Acids react with carbonates to release?
A
Hydrogen
B
Oxygen
C
Carbon dioxide (CO2)
✅
D
Chlorine
296
A substance that can act as both an acid and a base is?
A
Basic
B
Acidic
C
Amphoteric
✅
D
Neutral
297
Non-metal oxides (like CO2) are usually?
A
Basic
B
Acidic
✅
C
Neutral
D
Metallic
298
Metal oxides (like CaO) are usually?
A
Acidic
B
Basic
✅
C
Neutral
D
Inert
299
Which base is used in soap manufacturing?
A
HCl
B
NaOH
✅
C
NH3
D
H2SO4
300
Lime water is a solution of?
A
NaOH
B
KOH
✅
C
Ca(OH)2
D
Mg(OH)2
301
Substances that turn red litmus blue are?
A
Acids
B
Bases
✅
C
Salts
D
Elements
302
Citric acid is found in?
A
Stomach
B
Car batteries
C
Fruits
✅
D
Vinegar
303
Magnesium hydroxide is commonly used as a/an?
A
Fertilizer
B
Antacid
✅
C
Fuel
D
Dye
304
Which acid aids digestion in the stomach?
A
Sulfuric acid
B
Nitric acid
C
Hydrochloric acid
✅
D
Acetic acid
305
Ammonia (NH3) is a?
A
Strong acid
B
Weak acid
C
Strong base
D
Weak base
✅
306
Acidic oxides react with water to form?
A
Bases
B
Acids
✅
C
Salts
D
Metals
307
The strength of an acid is represented by its?
A
pH
B
Ka (dissociation constant)
✅
C
Mass
D
Volume
308
Which oxide is used in carbonated drinks?
A
CaO
B
SO2
C
CO2
✅
D
MgO
309
Baking soda is a?
A
Strong acid
B
Base (Sodium bicarbonate)
✅
C
Metal
D
Gas
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