Assertion : The kinetics of the reaction (m A+n B+p C m^ X+n^ Y+p^ Z ) obeys the rate expression as - ( d x d t =k[A]^m[B]^n ) Reason : The rate of reaction does not depend upon the concentration of (C ).

Step-by-step solution

Rate expression ( d x d t =k[A]^m[B]^n ) shows that the total order of reactions is (m+n+0=m+n ) as the rate of reaction is independent of concentration of (C ), i.e, the order with respect to (C ) is zero. This is the reason that (C ) does not figure in the rate expression.