Question

# In the reaction, $$P+Q\rightarrow R+S$$, the time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with reaction time as shown in the figure. The overall order of the reaction is:

A
2
B
3
C
0
D
1

Solution

## The correct option is D 1Overall order reaction can be decided by the data given $$t_{75\%}=2t_{50\%}$$.It is a first-order reaction with respect to $$P$$.From graph [Q] is linearly decreasing with time, i.e. order of reaction with respect to Q is zero and the rate expression is $$r =k [P]^{1}[Q]^{0}$$.Hence, (D) is correct.ChemistryNCERTStandard XII

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