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

A first order reaction is found to have a rate constant, k = 5 . 5 × 10 - 14 s - 1 . Find the half life of the reaction.

Given : k = 5 . 5 × 10 - 14 s - 1 Solution : Half life period is the time in which the molar concentration of reactants is reduced to half. Half life period of first order reactions : t 1 2 = 0 . 693 k So, t 1 2 = 0 . 693 5 . 5 × 10 - 14 = 1 . 26 × 10 13 s Hence, the value of half life of the reaction comes out to be 1 . 26 × 10 13 s .

Biopiracy may be defined as the robbery of indigenous knowledge of nature, naturally-occurring biological resources and genetic materials of a country by the technologically advanced country or organisation for commercial purpose or profit without any permission from or air compensation recognition to the peoples or nations in whose territory the materials were originally developed.

Specific non-coding sequences with unique tandem repeats

MEDIUM

Earn 100

What is the time limit for filing a complaint in a redressal agency for consumer protection from the date the cause of action arises?

50% studentsanswered this correctly

Important Questions on Chemical Kinetics

EASY

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

A first order reaction takes

40

minutes for

30 %

decomposition. Calculate

t_{1 / 2}

HARD

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

Derive an integrated rate equation for rate constant of a first order reaction.

EASY

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

Derive an integrated rate equation for a first order reaction.

MEDIUM

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

A first order reaction is

50 %

completed in

40

minutes at

300 K

and in

20

minutes at

320 K

. Calculate the activation energy of the reaction. (Given :

\log 2 = 0 \cdot 3010, \log 4 = 0 \cdot 6021, R = 8 \cdot 314 {JK}^{- 1} {mol}^{- 1}

)

EASY

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

Which of the following is not required for any of the techniques of DNA fingerprinting available at present?

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

MEDIUM

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

A first order reaction is found to have a rate constant,

k = 5.5 \times 10^{- 14} s^{- 1}

. Find the half life of the reaction.

MEDIUM

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

Define biopiracy.

MEDIUM

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

The figure shows a ray of light falling normally on the face AB of an equilateral glass prism having a refractive index $3 / 2$ , placed in water of refractive index $4 / 3$ . Will this ray suffer total internal reflection on striking the face AC? Justify your answer.

Question Image

EASY

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

The best quality optical fibres are made of :

HARD

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

In a reaction, the initial concentration of the reactants increases fourfold and the rate becomes eight times its initial value. The order of the reaction is -

EASY

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

Expand VNTR and describe its role in DNA fingerprinting.

EASY

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

When initial concentration of the reactant is doubled, what happens to the half-life period of a zero order reaction?

EASY

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

The rate constant for a first order reaction is

60 s^{- 1} .

How much time will it take to reduce the initial concentration of the reactant to its

1 / 16^{th}

value?

MEDIUM

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

The given plots represent the variation of the concentration of a reactant $R$ with time for two different reactions $(i) and (ii)$ . The respective orders of the reaction are
(i) Question Image

(ii) Question Image

MEDIUM

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

Under what conditions is the phenomenon of total internal reflection of light observed? Obtain the relation between the critical angle of incidence and the refractive index of the medium.

EASY

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

List any two applications of DNA fingerprinting technique.

EASY

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

DNA fingerprinting is based on;

HARD

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

A number of passengers were severely burnt beyond reorganisation during a train accident. Name and describe the modern technology that can help in handing over the dead to their relative.

EASY

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

VNTRs represents-

What is the time limit for filing a complaint in a redressal agency for consumer protection from the date the cause of action arises?

Important Questions on Chemical Kinetics

Learn and Prepare for any exam you want !