Class 12th Chemistry Chapter Chemical Kinetics free mcq test quiz

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12th Chemistry: Chemical Kinetics

1 / 10

1. Which of the following statements is not correct about order of a reaction.

The order of a reaction can be a fractional number.

Order of a reaction is experimentally determined quantity.

The order of a reaction is always equal to the sum of the stoichiometriccoefficients of reactants in the balanced chemical equation for a reaction.

The order of a reaction is the sum of the powers of molar concentrationof the reactants in the rate law expression

2 / 10

2. Which of the following statement is not correct for the catalyst?

It catalyses the forward and backward reaction to the same extent.

It alters ∆G of the reaction.

It is a substance that does not change the equilibrium constant of areaction.

It provides an alternate mechanism by reducing activation energybetween reactants and products.

3 / 10

3. Order of reaction is decided by

temperature

mechanism of reaction as well as relative concentration of reactants

molecularity

pressure

4 / 10

4. Point out the wrong statement: For a first order reaction

time for half-change (t_1/2) is independent of initial concentration

change in the concentration unit does not change the rate constant (k)

time for half-change × rate constant = 0.693

the unit of k is mole^–1 min^–1

5 / 10

5. The reaction A→ B follows first order kinetics. The timtaken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

2 hours

1 hour

0.5 hour

0.25 hour

6 / 10

6. The rate of reaction depends upon the

volume

force

pressure

conc. of reactants

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7. In the rate equation, when the conc. of reactants is unity then rate is equal to

specific rate constant

average rate constant

instantaneous rate constant

None of above

8 / 10

8. For the following reaction: NO₂(g) + CO(g) →NO(g) + CO₂(g), the rate law is: Rate = k [NO₂]₂. If 0.1 mole of gaseous carbon monoxide is added at constant temperatureto the reaction mixture which of the following statements is true?

Both k and the reaction rate remain the same

Both k and the reaction rate increase

Both k and the reaction rate decrease

Only k increases, the reaction rate remain the same

9 / 10

9. The rate law for the reaction xA + yB → mP + nQ is Rate = k [A]c[B]d. What is the total order of the reaction?

(x + y)

(m + n)

(c + d)

x/y

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10. Half life of a first order reaction is 4s and the initial concentration of the reactant is 0.12 M. The concentration of the reactant left after 16 s is

0.0075 M

0.06 M

0.03 M

0.015 M

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? Note: This quiz is entirely free, and all students of Class 12th Chemistry are invited to participate. Make the most of this opportunity to strengthen your understanding of Chemical Kinetics and excel in your exams!

Chapter wise quiz of XII class chemistry

In this quiz, you will have the opportunity to showcase your understanding of the following key concepts:

1️⃣ Reaction Rates: Understanding how fast or slow a chemical reaction takes place and factors affecting it.

2️⃣ Rate Laws: Determining the mathematical relationship between the concentration of reactants and the rate of a reaction.

3️⃣ Integrated Rate Laws: Exploring the concentration changes of reactants over time.

4️⃣ Activation Energy: Unraveling the energy barrier that reactants must overcome to initiate a chemical reaction.

5️⃣ Arrhenius Equation: Understanding the relationship between temperature, rate constant, and activation energy.

6️⃣ Catalysis: Examining the impact of catalysts on reaction rates and mechanisms.

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