# for a first order reaction the time taken to reduce the initial concentration

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## The time taken for a first order reaction to reduce the initial concentration by a factor of 1/4 is 10 minute. If the concentration is reduced to 1/16 then the time required is

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## The time taken for a first order reaction to reduce the initial concentration by a factor of 1/4 is 10 minute. If the concentration is reduced to 1/16 then the time required is

**A**

## 10 minute

**B**

## 96.33 minute

**C**

## 40 minute

**D**

## 80 minute

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Updated on : 2022-09-05

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Correct option is C)

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## For a first order reaction, the time taken to reduce the initial concentration by a factor of 1/4 is 10 min. If the reduction in concentration is carried out by by a factor of 1/16, then time required (in min) will be (1) 10 (2) 20 (3) 40 (4) 60

For a first order reaction, the time taken to reduce the initial concentration by a factor of 1/4 is 10 min. If the reduction in concentration is carried out by by a factor of 1/16, then time required (in min) will be (1) 10 (2) 20 (3) 40 (4) 60

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SIMILAR QUESTIONS

**Q.**For a first order reaction, the time taken for the initial concentration to become

1 / 4 t h

, is 10 minutes. What will be the time required to reduce the initial concentration to 1/16 of the initial value?

**Q.**In a 1st order reaction A

→

products, the concentration of the reactant decreases to 6.25

%

of its initial value in 80 minutes. What is (i) the rate constant and (ii) the rate of reaction, 100 minutes after the start, if the initial concentration is 0.2 mole/litre?

**Q.**

(A) follows first order reaction, (A)

→ product.

The concentration of A changes from 0.1 to 0.025 M in 40 min.

Find the rate of reaction of A when the concentration of A is 0.01 M.

**Q.**The value of rate constant for a first order reaction is

2.303 × 10 − 2 s e c − 1

. What will be the time required to reduce the concentration to

1 10 t h

of its initial concentration ?

**Q.**

Half life period of a first order reaction is 10 min. Startingwith initial concentration 12M, the rate after 20 min is

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## for a first order reaction , the time taken to reduce the initial concentration by a factor of (1)/(4) is 20 minutes . The time required to reduce intitial concentration by a factor of (1)/(16) is

1 overset(1^(st))to1//2 overset(2^(nd))to1//4overset(3^(rd))to1//8 overset(4^(th))to1//16 1/16 is 4 half-lives and 1/4 is 2 half-lives . It is given that the time taken for 2 half-lives is 20 minutes . So the time taken for 4 half-lives will be 40 minutes .

for a first order reaction , the time taken to reduce the initial concentration by a factor of

1 4

is 20 minutes . The time required to reduce intitial concentration by a factor of

1 16 is

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Updated On: 27-06-2022

Text Solution A 20 min B 10 min C 80 min D 40 min Answer

The correct Answer is d

Solution 1 1 s t −−→ 1 / 2 2 n d −−→ 1 / 4 3 r d −−→ 1 / 8 4 t h −−→ 1 / 16

1/16 is 4 half-lives and 1/4 is 2 half-lives . It is given that the time taken for 2 half-lives is 20 minutes . So the time taken for 4 half-lives will be 40 minutes .

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