SCERT Maharashtra solutions for Chemistry [English] 12 Standard HSC chapter 6 - Chemical Kinetics [Latest edition]

A First order reaction is 50% complete in 69.3 minutes. Time required for 90% completion for the same reaction is _______.

Time required for 100% completion of a zero order reaction is _______.

Rate constant of a reaction is 3.6 × 10^–3 s^–1. The order of reaction is ______.

The rate law relates to the rate of a chemical reaction in terms of _______.

For first order reaction, the rate constant for the decomposition of N₂O₅ is 6 × 10^–4 s ^–1. The half-life period for decomposition in seconds is ______.

Order of reaction for which unit of rate constant is mol dm^–3 s^–1 is _______.

The rate of catalysed reaction is large than the uncatalysed reaction as _______.

Which of the following is a unimolecular reaction?

Effect of catalyst in a chemical reaction is to change the _______.

Give one example of pseudo first-order reaction.

Write order of the following reaction:

\[\ce{2NH_{3(g)} -> N_{2(g)} + 3H_{2(g)}}\]

Identify molecularity of following reaction:

\[\ce{C2H5I_{(g)} -> C2H_{4(g)} + HI_{(g)}}\]

Rate constant for the reaction \[\ce{2N2O5 -> 4NO2 + O2}\] is 4.98 × 10^–4 s^–1. Find the order of reaction?

Write a mathematical expression for integrated rate law for zero-order reaction.

Name the slowest step that determines the rate in a complex reaction.

Give one example of zero order reaction.

For the reaction \[\ce{2NO_{(g)} + 2H_{2(g)} -> N_{2(g)} + 2H2O_{(g)}}\],

The rate law is, rate = k[NO]² [H₂].

What is the overall order of reaction?

What is half life of first order reaction if time required to decrease concentration of reactants from 0.8 M to 0.2 M is 12 hours?

Distinguish between Order and Molecularity of reaction.

For the reaction 2NOBr → 2NO₂ + Br₂, the rate law is rate = k[NOBr]₂. If the rate of a reaction is 6.5 × 10^–6 mol L^–1 s^–1, when the concentration of NOBr is 2 × 10^–3 mol L^–1. What would be the rate constant of the reaction?

Write four key points about order of reaction.

Explain pseudo first order reaction with a suitable example.

Define order of reaction with suitable examples.

Explain with the help of a potential energy diagram that the catalyst increases the rate of the reaction.

Derive an integrated rate law expression for first order reaction: A → B + C

Define molecularity.

The rate constant of the first order reaction is 1.386 min^–1. Calculate the time required for 80% reactant to decompose?

A reaction occurs in the following steps:

Step 1: \[\ce{NO_{2(g)} + F_2 -> NO2F_{(g)} + F_{(g)}}\] (slow)

Step 2: \[\ce{F_{(g)} + NO_{2(g)} -> NO_2F}\] (Fast)

1. Write the equation of overall reaction.
2. Write the rate law.
3. Identify reaction intermediate.

Define half life of a reaction.

Write units of rate constants for:

1. First-order reaction
2. Zero-order reaction

Write an expression for instantaneous rate of reaction:

2N₂O_(g) → 4NO_2(g) + O_2(g).

What is the order of reaction?

Why is molecularity applicable for only elementary reactions whereas order of a reaction is applicable for elementary and complex reactions? Explain with suitable examples.

For a zero-order reaction, molecularity can never be equal to zero. Explain.

For the reaction 2A + B → C, rate of disappearance of A 0.076 mol s ^–1.

1. What is the rate of formation of C?
2. What is the rate of consumption of B?
3. What is the rate of the overall reaction?

In a first-order reaction A → B, 60% of a given sample of a compound decomposes in 45 mins. What is the half-life of reaction? Also, write the rate law equation for the above first-order reaction.

Derive an expression for the relation between half-life and rate constant for first-order reaction.

The half-life period for the first order reaction is 1.7 hrs. How long will it take for 20% of the reactant to disappear?

Give one example of the reaction where order and molecularity are the same. 
Mention any two factors that influence the rate of chemical reaction.
If for the reaction A → products, a straight line graph passing through origin is obtained between the rate of reaction against concentration of A, what would be the order of reaction? Why?