Chemical Kinetics Class 12 Chemistry Free Online Mock Test 1

In 30 minutes, a first-order reaction is 50% complete. Calculate the amount of time it took to complete 87.5 percent of the reaction.

In a reaction, what is the driving force?

If a reaction’s rate is represented as rate = k [A]² [B], the reaction’s order will be

A reaction’s rate constant is k=3.28 × 10^-4 s^-1. Determine the reaction’s order.

Dimethyl ether breakdown is a fractional order process. rate =k(PCH₃OCH₃)^3/2 gives the rate. What are the units of rate and rate constant if pressure is measured in bars and time is measured in minutes?

(a bar min-1, bar2 min^-1

(b) bar min^-1, bar^1/2 min^-1

(c) bar^1/2 min^-1, bar² min^-1

(d) bar min^-1, bar^1/2 min^-1

The reaction NO₂ + CO → NO + CO₂ occurs in two steps. Locate the rate law.

2NO₂ → NO + NO₃ (k1) – slow

NO₃ + CO → CO₂ + NO₂ (k2) – fast

a) R = k1 [NO₂] ³

b) R = k2 [NO₃] [CO]

c) R = k1 [NO₂]

d) R = k1 [NO₂]²

Which of the following reactions is an example of a fractional order reaction?

((a) NH₄NO₂ → N₂+ 2H2O

(b) NO + O₃→ NO₂+ O₂

(c) 2NO + Br₂→ 2NOBr

(d) CH₃CHO → CH₄+ CO

The rate constant for the reaction 2H₂ + 2NO → 2H₂O + N₂ with rate = K|H₂||NO|², is

(a) mol L^-1 s^-1

(b) s^-1

(c) mol^-2  L² s^-1

(d)mol L^-1

What is the rate law for acid hydrolysis of an ester in aqueous solution, such as CH₃COOC₂H₅?

a) k [CH₃COOC₂H₅]

b) k [CH₃COOC₂H₅] [H₂O]

c) k [CH₃COOC₂H₅]²

d) k

If the concentration of material X is doubled and that of Y is halved, how many times will the rate of the elementary reaction 3X + Y = X₂Y change?

a) r2= 4.5r1

b) r2= 5r1

c) r2= 2r1

d) r2= 4r1

A reaction’s rate constant is determined by

The chemical reaction, 2O₃→ 3O₂ Proceeds as

O₃ ⇌ O₂+ |O| (fast)

|O| + O₃ → 2O₂ (slow)

The rate law expression will be

(a) Rate = k [O] [O₃]

(b) Rate = k [O₃]² [O2]^-1

(c) Rate = k [O₃]²

(d) Rate = k [O₂] [O]

For a given rate, the unit of rate and the rate constant are the same.

The number of molecules of the reactants involved in a single stage of the reaction indicates

For a unimolecular reaction,

The overall rate of a reaction is determined by

A first order reaction has a half-life length of 10 minutes. In 100 minutes, what proportion of the response will be completed?

For a 30 percent breakdown, a first order reaction takes 40 minutes. What will t_1/2 be?

The rate constant of a first order reaction is 1.15 10^-3s-1. How long will it take to decrease 5 g of this reactant to 3 g?

A straight line is drawn when log (a – x) is plotted against time t. This shows that the response is of order

In a chemical reaction, the activation energy is defined as