Q. In plants, which structure is primarily responsible for asexual reproduction? (2023)
A.
Roots
B.
Leaves
C.
Stems
D.
Flowers
Show solution
Solution
Stems, particularly in the form of runners or tubers, are primarily responsible for asexual reproduction in many plants.
Correct Answer: C — Stems
Learn More →
Q. In plants, which structure is responsible for sexual reproduction? (2021)
A.
Roots
B.
Leaves
C.
Flowers
D.
Stems
Show solution
Solution
Flowers are the reproductive structures in plants that facilitate sexual reproduction.
Correct Answer: C — Flowers
Learn More →
Q. In the context of atomic structure, what does the term 'isotope' refer to? (2021)
A.
Atoms with the same number of protons but different neutrons
B.
Atoms with different numbers of protons
C.
Atoms with the same mass number
D.
Atoms that are chemically identical
Show solution
Solution
Isotopes are defined as atoms that have the same number of protons but different numbers of neutrons.
Correct Answer: A — Atoms with the same number of protons but different neutrons
Learn More →
Q. In the context of atomic structure, what does the term 'quantum leap' refer to? (2022)
A.
Movement of electrons in a circular path
B.
Transition of an electron between energy levels
C.
Emission of light
D.
Absorption of energy
Show solution
Solution
A 'quantum leap' refers to the transition of an electron between discrete energy levels in an atom.
Correct Answer: B — Transition of an electron between energy levels
Learn More →
Q. In the context of measurements, what does precision refer to? (2022)
A.
Closeness to the true value
B.
Consistency of repeated measurements
C.
Range of values
D.
Average of measurements
Show solution
Solution
Precision refers to the consistency of repeated measurements, regardless of their accuracy.
Correct Answer: B — Consistency of repeated measurements
Learn More →
Q. In the context of surface chemistry, what does the term 'adsorption' refer to? (2022)
A.
The process of a substance being taken up by a liquid
B.
The process of a substance adhering to a surface
C.
The process of a substance dissolving in a solvent
D.
The process of a substance being absorbed into a solid
Show solution
Solution
Adsorption refers to the process where molecules adhere to the surface of a solid or liquid, forming a film.
Correct Answer: B — The process of a substance adhering to a surface
Learn More →
Q. In the context of surface chemistry, what does the term 'desorption' mean? (2023)
A.
The process of adsorption
B.
The release of adsorbed molecules from a surface
C.
The absorption of a gas into a liquid
D.
The formation of a solid from a gas
Show solution
Solution
Desorption refers to the process where adsorbed molecules are released from the surface back into the gas or liquid phase.
Correct Answer: B — The release of adsorbed molecules from a surface
Learn More →
Q. In the context of surface chemistry, what does the term 'desorption' refer to? (2022)
A.
The process of adsorption
B.
The release of adsorbate from the surface
C.
The formation of a new layer
D.
The increase in surface area
Show solution
Solution
Desorption refers to the process by which an adsorbate is released from the surface of the adsorbent.
Correct Answer: B — The release of adsorbate from the surface
Learn More →
Q. In the context of surface chemistry, what does the term 'surface area' refer to? (2020)
A.
Total area of the solid
B.
Area available for adsorption
C.
Area of the bulk material
D.
Area of the gas
Show solution
Solution
In surface chemistry, 'surface area' refers to the area available for adsorption, which is crucial for determining the adsorption capacity.
Correct Answer: B — Area available for adsorption
Learn More →
Q. In the electrochemical cell, what occurs at the anode? (2022)
A.
Reduction
B.
Oxidation
C.
Neutralization
D.
Precipitation
Show solution
Solution
At the anode of an electrochemical cell, oxidation occurs, which involves the loss of electrons.
Correct Answer: B — Oxidation
Learn More →
Q. In the electrochemical cell, which electrode is the site of reduction? (2023)
A.
Anode
B.
Cathode
C.
Salt bridge
D.
Electrolyte
Show solution
Solution
In an electrochemical cell, the cathode is the electrode where reduction occurs.
Correct Answer: B — Cathode
Learn More →
Q. In the electrochemical series, which element is the best reducing agent? (2022)
Show solution
Solution
Li is the best reducing agent among the given alkali metals due to its low ionization energy.
Correct Answer: A — Li
Learn More →
Q. In the electrochemical series, which element is the strongest oxidizing agent? (2023)
Show solution
Solution
Fluorine (F2) is the strongest oxidizing agent in the electrochemical series due to its high electronegativity and tendency to gain electrons.
Correct Answer: B — F2
Learn More →
Q. In the electrochemical series, which of the following has the highest reduction potential? (2022)
A.
Li+
B.
Na+
C.
K+
D.
F+
Show solution
Solution
Fluorine (F+) has the highest reduction potential in the electrochemical series, indicating it is a strong oxidizing agent.
Correct Answer: D — F+
Learn More →
Q. In the hydrogen atom, which transition would emit the photon with the highest energy? (2019)
A.
n=2 to n=1
B.
n=3 to n=2
C.
n=4 to n=3
D.
n=5 to n=4
Show solution
Solution
The energy of the emitted photon is highest for the transition from n=2 to n=1, as it involves the largest energy difference.
Correct Answer: A — n=2 to n=1
Learn More →
Q. In the kinetic theory of gases, the temperature of a gas is a measure of: (2022)
A.
The average potential energy of the molecules
B.
The average kinetic energy of the molecules
C.
The total energy of the gas
D.
The number of molecules in the gas
Show solution
Solution
In the kinetic theory of gases, the temperature of a gas is a measure of the average kinetic energy of the molecules.
Correct Answer: B — The average kinetic energy of the molecules
Learn More →
Q. In the kinetic theory of gases, the term 'elastic collision' means: (2019)
A.
Kinetic energy is conserved
B.
Momentum is conserved
C.
Both kinetic energy and momentum are conserved
D.
Neither kinetic energy nor momentum is conserved
Show solution
Solution
In elastic collisions, both kinetic energy and momentum are conserved, which is a key assumption in the kinetic theory of gases.
Correct Answer: C — Both kinetic energy and momentum are conserved
Learn More →
Q. In the kinetic theory, the internal energy of an ideal gas is primarily due to:
A.
Potential energy
B.
Kinetic energy of molecules
C.
Work done on the gas
D.
Heat energy
Show solution
Solution
In an ideal gas, the internal energy is primarily due to the kinetic energy of the gas molecules, as potential energy is negligible.
Correct Answer: B — Kinetic energy of molecules
Learn More →
Q. In the kinetic theory, the temperature of a gas is a measure of: (2022)
A.
The average potential energy of the molecules
B.
The average kinetic energy of the molecules
C.
The total energy of the gas
D.
The speed of the gas molecules
Show solution
Solution
In the kinetic theory, the temperature of a gas is a measure of the average kinetic energy of the molecules.
Correct Answer: B — The average kinetic energy of the molecules
Learn More →
Q. In the Langmuir adsorption isotherm, which assumption is NOT made? (2019)
A.
Adsorption occurs on a surface with a finite number of identical sites
B.
Adsorption is reversible
C.
There is no interaction between adsorbed molecules
D.
Adsorption occurs only at high pressures
Show solution
Solution
The Langmuir isotherm assumes that adsorption occurs at all pressures, not just high pressures.
Correct Answer: D — Adsorption occurs only at high pressures
Learn More →
Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons as the frequency of incident light increases? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
According to the photoelectric effect, the kinetic energy of emitted electrons increases with the frequency of the incident light, provided the frequency is above the threshold frequency.
Correct Answer: A — Increases
Learn More →
Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons when the frequency of incident light is increased? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
According to the photoelectric effect, the kinetic energy of emitted electrons increases with the frequency of the incident light, provided the frequency is above the threshold frequency.
Correct Answer: A — Increases
Learn More →
Q. In the photoelectric effect, what happens when the frequency of incident light is increased? (2020)
A.
More electrons are emitted
B.
Electrons are emitted with higher energy
C.
No electrons are emitted
D.
The current decreases
Show solution
Solution
Increasing the frequency of incident light increases the energy of emitted electrons, as per E = hf.
Correct Answer: B — Electrons are emitted with higher energy
Learn More →
Q. In the reaction 2Ag+ + Zn → 2Ag + Zn^2+, which element is oxidized? (2020)
A.
Ag
B.
Zn
C.
O
D.
None of the above
Show solution
Solution
In this reaction, zinc (Zn) is oxidized as it loses electrons to form Zn^2+.
Correct Answer: B — Zn
Learn More →
Q. In the reaction 2Ag⁺ + Zn → 2Ag + Zn²⁺, which species is reduced? (2023)
A.
Ag⁺
B.
Zn
C.
Ag
D.
Zn²⁺
Show solution
Solution
In this reaction, Ag⁺ gains electrons to form Ag, thus it is reduced.
Correct Answer: A — Ag⁺
Learn More →
Q. In the reaction 2Fe2O3 + 3C → 4Fe + 3CO2, which species is oxidized? (2019)
A.
Fe2O3
B.
C
C.
Fe
D.
CO2
Show solution
Solution
In this reaction, carbon (C) is oxidized as it loses electrons to form CO2.
Correct Answer: B — C
Learn More →
Q. In the reaction 2Fe²⁺ + 2e⁻ → 2Fe, what is being reduced? (2021)
A.
Fe²⁺
B.
Fe
C.
e⁻
D.
None of the above
Show solution
Solution
In this reaction, Fe²⁺ is being reduced as it gains electrons to form Fe.
Correct Answer: A — Fe²⁺
Learn More →
Q. In the reaction 2Fe²⁺ + 2MnO4⁻ → 2Fe³⁺ + 2Mn²⁺, what is the oxidation state change for iron? (2021)
A.
+2 to +3
B.
+3 to +2
C.
0 to +2
D.
−2 to 0
Show solution
Solution
Iron changes its oxidation state from +2 to +3, indicating that it is oxidized.
Correct Answer: A — +2 to +3
Learn More →
Q. In the reaction 2Fe²⁺ + Cl2 → 2Fe³⁺ + 2Cl⁻, what is being oxidized? (2021)
A.
Fe²⁺
B.
Cl2
C.
Fe³⁺
D.
Cl⁻
Show solution
Solution
In this reaction, Fe²⁺ is being oxidized to Fe³⁺ as it loses electrons.
Correct Answer: A — Fe²⁺
Learn More →
Q. In the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O, what is being oxidized? (2019)
A.
MnO4-
B.
C2O4^2-
C.
H+
D.
CO2
Show solution
Solution
C2O4^2- (oxalate ion) is being oxidized to CO2 in this reaction.
Correct Answer: B — C2O4^2-
Learn More →
Showing 451 to 480 of 2776 (93 Pages)