The decomposition of ammonia on a platinum surface is a zero-order reaction. If the rate constant is 4 × 10 - 3 Mol . L - 1 . s - 1 , how long will it take to reduce the initial concentration of ammonia from 0 . 1 M to 0 . 064 M .

We have given, Decomposition of ammonia is a zero-order reaction. Initial concentration, R 0 = 0 . 1 M Final concentration, R t = 0 . 064 M Then time, t = ? From the expression for a zero-order rate constant, required time t = [ R ] ∘ − [ R ] t k Substituting the given values, t = [ 0 . 1 − 0 . 064 ] 4 × 10 - 3 = 0 . 936 4 × 10 - 3 t = 234 secs So, the time taken to reduce the initial concentration of ammonia from 0 . 1 M to 0 . 064 M = 234 sec

The given graph is a representation of kinetics of a reaction. The y and x axes for zero and first order reactions, respectively are

zero order ( y = rate and x = concentration), first order ( y = t 1 2 and x = concentration)

zero order ( y = concentration and x = time), first order ( y = rate constant and x = concentration)

zero order ( y = rate and x = concentration), first order ( y = rate and x = t 1 2

zero order ( y = concentration and x = time), first order ( y = t 1 2 and x = concentration)

MEDIUM

Earn 100

The number of incorrect statement/s from the following is ______________

A. The successive half lives of zero order reactions decreases with time.

B. A substance appearing as reactant in the chemical equation may not affect the rate of reaction

C. Order and molecularity of a chemical reaction can be a fractional number

D. The rate constant units of zero and second order reaction are $molL {}^{- 1} s^{- 1}$ and ${mol}^{- 1} L s^{- 1}$ respectively

44.19% studentsanswered this correctly

Important Questions on Chemical Kinetics

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Derive an expression of rate constant for zero order reaction.

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Which expression among the following is correct for a zero-order reaction and a first order reaction respectively? Here

' a'

denotes the intial concentration of reactant:

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Starting from the integrated law of a zero-order reaction,

R \to P

, show that the half-life time of a reaction is directly proportional to the initial molar concentration of the reactant.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Write the mathematical relation between half life of zero order reaction and its rate constant.

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

For a zero - order reaction with rate constant k, the slope of the plot reactant concentration against time is

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

For a first-order reaction, prove that

t_{99.9 %} = 10 t_{1 / 2}

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

The decomposition of ammonia on a platinum surface is a zero-order reaction. If the rate constant is

4 \times 10^{- 3} Mol . L^{- 1} . s^{- 1}

, how long will it take to reduce the initial concentration of ammonia from

0.1 M to 0.064 M

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Draw the graph of half-life period

(t_{\frac{1}{2}})

versus initial concentration of reactant

({[a]}_{0})

for a zero order reaction. Give reasons in favour of your answer.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

In a zero order reaction, when

dx / dt

is plotted against

(a - x)

is obtained.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Rate constant for zero order reaction is

2 \times 10^{- 2} mol L^{- 1} s^{- 1},

if the concentration of the reactant after

25 \sec .

0.5 M .

What is the initial concentration of reactant?

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Which of the following relation is correct for zero-order reaction?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

The half-life for a zero order reaction having

0.02 M

initial concentration of reactant is

100 s

. The rate constant (in

mol L^{- 1} s^{- 1}

) for the reaction is

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Examine the graph given below. Identify the integrated rate equation and the order of the reaction corresponding to it.

Question Image

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Determine the expression of rate constant for zero order reaction.

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

The half-life of a zero order reaction is

x

second. If the reaction takes

t_{1}

second to complete, calculate

t_{1}

in terms of

x

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

The given graph is a representation of kinetics of a reaction.

Question Image

The $y$ and $x$ axes for zero and first order reactions, respectively are

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Derive the integrated rate equation of Zero Order Reaction.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

For zero order reaction, a plot of

t_{1 / 2}

versus

[A]_{0}

will be

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

Under the same reaction conditions, initial concentration of

1.386 mol {dm}^{- 3}

of a substance becomes half in

40 s

and

20 s

through first order and zero order kinetics, respectively. Ratio

(\frac{k_{1}}{k_{0}})

of the rate of constants for first order

(k_{1})

and zero order

(k_{0})

of the reaction is

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Integrated Rate Law for Zero and First Order Reactions

The rate constant of the reaction

A ⟶ B

0.6 \times 10^{- 3}

mole per liter per second. If the initial concentration of A is 5 M, then the concentration of B after 20 minutes is:

Important Questions on Chemical Kinetics

Learn and Prepare for any exam you want !