Q.

For H2+Cl2 hษ 2HCl, rate of reaction at t=0 is given by rate =-ddtH2=6×10-3M-min-1, then rate of the reaction at t=30 min is

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a

ddt[Cl2]=6×104Mmin1

b

 Zero

c

12ddt[HCl]=12×103Mmin1

answer is A.

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Detailed Solution

The given reaction is:

 H2+Cl2 hv 2HCl

It is a photochemical reaction, due to which it is a zero-order reaction.

The rate law for the reaction can be written as:

 =-ddtH2=-ddtCl2= 12ddtHCl

The given value is =-ddtH2=6×10-3M-min-1

So, for Chlorine it will be:

 =-ddtCl2=6×10-3M-min-1

For Ammonia it will be:

 =12ddtHCl=6×10-3M-min-12=3×10-3M-min-1

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