Assertion :For a first order reaction, $t_{1 / 2}$ is independent of rate constant. Reason: For a first order reaction, $t_{1 / 2} \propto [R]_{0}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
For a first order reaction half-life period is constant i.e. it is independent of initial concentration of the reacting species. It is related to rate constant as $t_{1 / 2} = \frac{0.693}{k}$ .

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Similar questions

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

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Assertion :For a first order reaction, t1/2 is independent of rate constant. Reason: For a first order reaction, t1/2∝[R]0.

The correct option is D Both Assertion and Reason are incorrectFor a first order reaction half-life period is constant i.e. it is independent of initial concentration of the reacting species. It is related to rate constant as t1/2=0.693k.

Assertion :For a first order reaction, $t_{1 / 2}$ is independent of rate constant. Reason: For a first order reaction, $t_{1 / 2} \propto [R]_{0}$ .

The correct option is D Both Assertion and Reason are incorrect
For a first order reaction half-life period is constant i.e. it is independent of initial concentration of the reacting species. It is related to rate constant as $t_{1 / 2} = \frac{0.693}{k}$ .