Question

19. In the following reaction :
A → B + C, rate constant = 0.001 Ms-1. If we
start with 1 M of A then conc. of A and B after 10
minutes respectively are
(1) 0.5 M, 0.5 M (2) 0.6 M, 0.4 M.
(3) 0.4 M, 0.6 M (4) 0.1 M, 0.9 M​

Answer 1

concentration of A and B after 10 minutes will be 0.4 M and 0.6 M

Explanation:

Consider the given equation

A→B+C

Rate constant=$0.001Ms^{-1}$

Then the starting value will be

$[C_{0} ]_{A} =1M$

From unit of rate constant

we can conclude that rate is of zero order.

Decrease in concentration of A in 10min=0.01*10*60

=0.6 M

similarly

$[C_{0} ]_{A} t=10 min=1-6=0.4M$

$[C_{B} ]t=10 min=0.6 M$

so option 3 is correct

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