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NEET 2017

Exam: NEET
Year: 2017
Subject: Chemistry
Chapter: Chemical Kinetics

NEET 2017 · Chemistry · Chemical Kinetics

A first-order reaction has a specific reaction rate 10 ^ - 2 ^ - 1...

A first-order reaction has a specific reaction rate

{10}^{- 2}\sec^{- 1} .

How much time will it take for

20g

the reactant to reduce to

5g

?

Options

A $238 . 6second$
B $138 . 6second$
C $346 . 5second$
D $693 . 0second$

Correct answer

B. $138 . 6second$

Step-by-step solution

t\dfrac{1}{2} = \dfrac{0 .693}{{10}^{- 2}}second

For the reduction of

20g

of reactant to

5g

, two

t\dfrac{1}{2}

is required.

∴ t = 2 \times \dfrac{0 .693}{{10}^{- 2}}second

= 138.6second

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