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
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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
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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
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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
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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
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.
Correct Answer: B — Shift to the left
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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
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.
Correct Answer: B — Shift to the left
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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
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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
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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
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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
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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
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Solution
A decrease in oxidation state indicates that the element has gained electrons, which means it is reduced.
Correct Answer: B — It is reduced
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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
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Solution
A decrease in oxidation state indicates that the element has gained electrons, which is defined as reduction.
Correct Answer: B — Reduction
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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
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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
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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
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Solution
If the oxidation state of an element decreases, it is gaining electrons, which is known as reduction.
Correct Answer: B — Reduction
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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
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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
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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
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Solution
The substance that gains electrons in a redox reaction is called the oxidizing agent.
Correct Answer: A — Oxidizing agent
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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
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Solution
The oxidation state of the reducing agent decreases as it loses electrons during the reaction.
Correct Answer: B — Decreases
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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
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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
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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
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Solution
In a reversible process, the work done is always maximum compared to irreversible processes.
Correct Answer: A — Always maximum
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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
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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
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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
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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
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Solution
If the forward reaction is exothermic, the reverse reaction must be endothermic, as it absorbs heat.
Correct Answer: B — It is endothermic
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Q. In a simple cubic lattice, how many atoms are present in one unit cell? (2019)
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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
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Q. In an electrochemical cell, the anode is where: (2019)
A.
Oxidation occurs
B.
Reduction occurs
C.
Electrons are gained
D.
Ions are produced
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Solution
In an electrochemical cell, oxidation occurs at the anode.
Correct Answer: A — Oxidation occurs
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Q. In electrolysis, the process of oxidation occurs at which electrode? (2019)
A.
Anode
B.
Cathode
C.
Both electrodes
D.
None of the above
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Solution
In electrolysis, oxidation occurs at the anode.
Correct Answer: A — Anode
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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
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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
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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
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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
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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
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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
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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
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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
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Q. In the electrochemical cell, what occurs at the anode? (2022)
A.
Reduction
B.
Oxidation
C.
Neutralization
D.
Precipitation
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Solution
At the anode of an electrochemical cell, oxidation occurs, which involves the loss of electrons.
Correct Answer: B — Oxidation
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Q. In the electrochemical cell, which electrode is the site of reduction? (2023)
A.
Anode
B.
Cathode
C.
Salt bridge
D.
Electrolyte
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Solution
In an electrochemical cell, the cathode is the electrode where reduction occurs.
Correct Answer: B — Cathode
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Q. In the electrochemical series, which element is the best reducing agent? (2022)
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Solution
Li is the best reducing agent among the given alkali metals due to its low ionization energy.
Correct Answer: A — Li
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Q. In the electrochemical series, which element is the strongest oxidizing agent? (2023)
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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
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Q. In the electrochemical series, which of the following has the highest reduction potential? (2022)
A.
Li+
B.
Na+
C.
K+
D.
F+
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Solution
Fluorine (F+) has the highest reduction potential in the electrochemical series, indicating it is a strong oxidizing agent.
Correct Answer: D — F+
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