1.
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and $${{\text{k}}_{\text{g}}}$$ respectively. The effective rate constant (keff) is given by

3.
Catalyst is a substance, which __________ chemical reaction.

4.
A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)