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The rate constant of the reaction $A \to B$ is $0.6 \times 10^{- 3} m o l L^{- 1} s^{- 1}$ If the initial concentration of A is 5 M, then concentration of B after 1200 seconds is

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3.60 M

1.08 M

0.36 M

0.72 M

answer is C.

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Detailed Solution

Reaction is zero order as the unit of rate constant is $m o l L^{- 1} S^{- 1}$

$∴ conc. of B = K . t = 0.6 \times 10^{- 5} \times 20 \times 60 = 0.72 M$

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