JEE Main 2022 · 28 Jul · Shift 1 · Chemistry Q86

← JEE Main 2022 · 28 Jul · Shift 1

ChemistryInteger+4 / -1Question 86 of 90

For the given first order reaction

A → B

the half life of the reaction is 0.3010 min. The ratio of the initial concentration of reactant to the concentration of reactant at time 2.0 min will be equal to ______. (Nearest integer)

Your answer

Answer and worked solution

Official answer: 100

Rate constant $k=\frac{0.693}{0.301}=2.303$ min $^{-1}$ .

Ratio. $\log\frac{[A]_0}{[A]}=\frac{kt}{2.303}=2$ , so the ratio is 100.

Answer: 100

Topics:Integrated rate equations Half-life

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JEE Main 2022 · 28 Jul · Shift 1, Chemistry question 86