NEET 2022 · ChemistryIntegrated ratePrevious Year Question

For a first order reaction $A Products$ , initial concentration of $A$ is $0.1 M$ , which becomes $0.001 M$ after 5 minutes. Rate constant for the reaction in $min^{- 1}$ is:

Answer: (B) 0.9212. \textbf{Answer:} (B) 0.9212 \textbf{Solution:} For a first order reaction: $k = \frac{2.303}{t} lo g \frac{[ A ] _{0}}{[ A ]}$ Here $[A]_{0} = 0.1 M$ , $[A] = 0.001 M$ , $t = 5 min$ .

A.1.3818
B.0.9212✓
C.0.4606
D.0.2303

Correct Answer

(B) 0.9212

Solution & Explanation

\textbf{Answer:} (B) 0.9212 \textbf{Solution:} For a first order reaction: $k = \frac{2.303}{t} lo g \frac{[ A ] _{0}}{[ A ]}$ Here $[A]_{0} = 0.1 M$ , $[A] = 0.001 M$ , $t = 5 min$ . $k = \frac{2.303}{5} lo g \frac{0.1}{0.001} = \frac{2.303}{5} lo g (100) = \frac{2.303}{5} \times 2 = \frac{4.606}{5} = 0.9212 min^{- 1}$

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For a first order reaction A​Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the reaction in min−1 is:

Solution & Explanation

More NEET PYQ solutions

For a first order reaction $A Products$ , initial concentration of $A$ is $0.1 M$ , which becomes $0.001 M$ after 5 minutes. Rate constant for the reaction in $min^{- 1}$ is: