The rate expression for a heterogenous catalytic reaction is given by,

1.	The rate expression for a heterogenous catalytic reaction is given by, - r A = K . K A P A (1 + K A . P A + K R . P R ), where K is surface reaction rate constant and K A and K R are absorption equilibrium constants of A and R respectively. If K R P R >> (1 + K A P A ), the apparent activation energy E A is equal to (given E is the activation energy for the reaction and ? H R and ? H A are the activation energies of adsorption of R and A )
A.	E
B.	E + ? H A
C.	E + ? H A - ? H R )
D.	? H A + ? H R
Answer» D. ? H A + ? H R

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