Q. In a hexagonal close-packed (HCP) structure, how many atoms are present in one unit cell? (2023)
Show solution
Solution
In a hexagonal close-packed (HCP) structure, there are 6 atoms per unit cell.
Correct Answer: C — 6
Learn More →
Q. In a hexagonal close-packed (HCP) structure, what is the coordination number? (2022)
Show solution
Solution
In a hexagonal close-packed (HCP) structure, the coordination number is 12, as each atom is in contact with 12 others.
Correct Answer: C — 12
Learn More →
Q. In a reaction at equilibrium, if the concentration of a reactant is increased, what will happen to the equilibrium position? (2019)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Depends on temperature
Show solution
Solution
Increasing the concentration of a reactant will shift the equilibrium position to the right, favoring the formation of products.
Correct Answer: A — Shift to the right
Learn More →
Q. In a reaction at equilibrium, if the concentration of products is increased, what will happen? (2022)
A.
Equilibrium shifts to the left
B.
Equilibrium shifts to the right
C.
No change
D.
Reaction stops
Show solution
Solution
According to Le Chatelier's principle, increasing the concentration of products will shift the equilibrium to the left, favoring the formation of reactants.
Correct Answer: A — Equilibrium shifts to the left
Learn More →
Q. In a reaction at equilibrium, if the concentration of reactants is increased, what will happen? (2022)
A.
The equilibrium will shift to the right.
B.
The equilibrium will shift to the left.
C.
The equilibrium will not change.
D.
The reaction will stop.
Show solution
Solution
According to Le Chatelier's principle, if the concentration of reactants is increased, the equilibrium will shift to the right to produce more products.
Correct Answer: A — The equilibrium will shift to the right.
Learn More →
Q. In a reaction at equilibrium, if the concentration of reactants is increased, what will happen to the position of equilibrium? (2022)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Depends on temperature
Show solution
Solution
According to Le Chatelier's principle, increasing the concentration of reactants will shift the equilibrium position to the right to produce more products.
Correct Answer: A — Shift to the right
Learn More →
Q. In a reaction at equilibrium, if the temperature is increased and the reaction is exothermic, what will happen? (2021)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in Kc
Show solution
Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.
Correct Answer: B — Shift to the left
Learn More →
Q. In a reaction at equilibrium, if the temperature is increased for an exothermic reaction, what will happen? (2022)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in pressure
Show solution
Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.
Correct Answer: B — Shift to the left
Learn More →
Q. In a reaction mechanism, what is the term for the slowest step that determines the overall rate of the reaction? (2019)
A.
Intermediate
B.
Rate-determining step
C.
Catalyst
D.
Transition state
Show solution
Solution
The slowest step in a reaction mechanism that determines the overall rate of the reaction is called the rate-determining step.
Correct Answer: B — Rate-determining step
Learn More →
Q. In a reaction, if the concentration of reactants is doubled, what happens to the rate of reaction if it is first order? (2023)
A.
Doubles
B.
Triples
C.
Quadruples
D.
Remains the same
Show solution
Solution
For a first-order reaction, the rate is directly proportional to the concentration of the reactant, so doubling the concentration doubles the rate.
Correct Answer: A — Doubles
Learn More →
Q. In a reaction, if the concentration of reactants is doubled, what happens to the rate of reaction if the reaction is first order? (2023)
A.
Doubles
B.
Triples
C.
Quadruples
D.
Remains the same
Show solution
Solution
For a first-order reaction, the rate is directly proportional to the concentration of reactants, so doubling the concentration doubles the rate.
Correct Answer: A — Doubles
Learn More →
Q. In a redox reaction, if the oxidation number of an element increases, what happens to that element? (2020)
A.
It is oxidized
B.
It is reduced
C.
It remains unchanged
D.
It forms a compound
Show solution
Solution
An increase in oxidation number indicates that the element is losing electrons, which means it is being oxidized.
Correct Answer: A — It is oxidized
Learn More →
Q. In a redox reaction, if the oxidation state of an element decreases, what happens to that element? (2021)
A.
It is oxidized
B.
It is reduced
C.
It remains unchanged
D.
It is ionized
Show solution
Solution
A decrease in oxidation state indicates that the element has gained electrons, which means it is reduced.
Correct Answer: B — It is reduced
Learn More →
Q. In a redox reaction, if the oxidation state of an element decreases, what has occurred? (2021)
A.
Oxidation
B.
Reduction
C.
Neutralization
D.
Decomposition
Show solution
Solution
A decrease in oxidation state indicates that the element has gained electrons, which is defined as reduction.
Correct Answer: B — Reduction
Learn More →
Q. In a redox reaction, if the oxidation state of an element decreases, what is happening to that element? (2021)
A.
It is being oxidized
B.
It is being reduced
C.
It is unchanged
D.
It is ionized
Show solution
Solution
A decrease in oxidation state indicates that the element is gaining electrons, which means it is being reduced.
Correct Answer: B — It is being reduced
Learn More →
Q. In a redox reaction, if the oxidation state of an element decreases, what is it undergoing? (2021)
A.
Oxidation
B.
Reduction
C.
Neutralization
D.
Decomposition
Show solution
Solution
If the oxidation state of an element decreases, it is gaining electrons, which is known as reduction.
Correct Answer: B — Reduction
Learn More →
Q. In a redox reaction, if the oxidation state of an element increases, what happens to that element? (2021)
A.
It is oxidized
B.
It is reduced
C.
It remains unchanged
D.
It forms a compound
Show solution
Solution
An increase in the oxidation state of an element indicates that it has lost electrons, which means it is oxidized.
Correct Answer: A — It is oxidized
Learn More →
Q. In a redox reaction, the substance that gains electrons is called: (2021)
A.
Oxidizing agent
B.
Reducing agent
C.
Reducing agent
D.
None of the above
Show solution
Solution
The substance that gains electrons in a redox reaction is called the oxidizing agent.
Correct Answer: A — Oxidizing agent
Learn More →
Q. In a redox reaction, what happens to the oxidation state of the reducing agent? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Varies
Show solution
Solution
The oxidation state of the reducing agent decreases as it loses electrons during the reaction.
Correct Answer: B — Decreases
Learn More →
Q. In a redox reaction, which of the following statements is true? (2020)
A.
Oxidation involves gain of electrons
B.
Reduction involves loss of electrons
C.
Oxidation state of an element decreases during oxidation
D.
Reduction involves gain of electrons
Show solution
Solution
Reduction is defined as the gain of electrons, which decreases the oxidation state of the element.
Correct Answer: D — Reduction involves gain of electrons
Learn More →
Q. In a reversible process, the work done is: (2023)
A.
Always maximum
B.
Always minimum
C.
Equal to the heat absorbed
D.
Independent of the path
Show solution
Solution
In a reversible process, the work done is always maximum compared to irreversible processes.
Correct Answer: A — Always maximum
Learn More →
Q. In a reversible reaction at equilibrium, if the concentration of reactants is increased, what will happen to the equilibrium position? (2023)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Depends on temperature
Show solution
Solution
According to Le Chatelier's principle, increasing the concentration of reactants will shift the equilibrium position to the right, favoring the formation of products.
Correct Answer: A — Shift to the right
Learn More →
Q. In a reversible reaction at equilibrium, what happens if the temperature is increased? (2019)
A.
The reaction shifts to the exothermic side
B.
The reaction shifts to the endothermic side
C.
No change occurs
D.
The reaction rate decreases
Show solution
Solution
Increasing the temperature of an exothermic reaction shifts the equilibrium to the left (towards the reactants), while for an endothermic reaction, it shifts to the right (towards the products).
Correct Answer: B — The reaction shifts to the endothermic side
Learn More →
Q. In a reversible reaction, if the forward reaction is exothermic, what can be said about the reverse reaction? (2022)
A.
It is also exothermic
B.
It is endothermic
C.
It has no effect on equilibrium
D.
It is spontaneous
Show solution
Solution
If the forward reaction is exothermic, the reverse reaction must be endothermic, as it absorbs heat.
Correct Answer: B — It is endothermic
Learn More →
Q. In a simple cubic lattice, how many atoms are effectively present in one unit cell? (2019)
Show solution
Solution
In a simple cubic lattice, there is 1 atom effectively present in one unit cell, as each corner atom contributes 1/8th of an atom to the unit cell.
Correct Answer: A — 1
Learn More →
Q. In a simple cubic lattice, how many atoms are present in one unit cell? (2019)
Show solution
Solution
In a simple cubic lattice, there is 1 atom per unit cell (1/8 atom from each of the 8 corners).
Correct Answer: A — 1
Learn More →
Q. In an electrochemical cell, the anode is where: (2019)
A.
Oxidation occurs
B.
Reduction occurs
C.
Electrons are gained
D.
Ions are produced
Show solution
Solution
In an electrochemical cell, oxidation occurs at the anode.
Correct Answer: A — Oxidation occurs
Learn More →
Q. In electrolysis, the process of oxidation occurs at which electrode? (2019)
A.
Anode
B.
Cathode
C.
Both electrodes
D.
None of the above
Show solution
Solution
In electrolysis, oxidation occurs at the anode.
Correct Answer: A — Anode
Learn More →
Q. In the context of adsorption, what does the term 'selectivity' refer to? (2022)
A.
The ability to adsorb multiple gases
B.
The preference for one gas over another
C.
The rate of adsorption
D.
The temperature dependence of adsorption
Show solution
Solution
Selectivity in adsorption refers to the preference of an adsorbent for one gas over another, which can be crucial in separation processes.
Correct Answer: B — The preference for one gas over another
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 →
Showing 31 to 60 of 626 (21 Pages)