Discussion Forum

1)

In the reaction, P+Q →  R+S

 the time taken for 75% reaction of P 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 

 

Answer:

Option D

Explanation:

Plan    Time of 75%  reaction is twice the time taken for 50%  reaction if it is first order reaction w.r.t P . From graph ,[Q} decrease lineraly with time ,  thus  it is  zeroth order reaction  w.r.t Q

$\frac{dx}{dt}=K[P]^{a}[Q]^{b}$

  Order w.r.t   P=a=1

Order w.r.t   Q= b=0

  Thus overall prder  of the reaction

                 =1+0=1