2. The half-life period of a first order reaction is given by (where k = rate constant). (A) 1.5 k (B) 2.5 k (C) 0.693/k (D) 6.93 k

10. In Langmuir treatment of adsorption, (A) Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule (B) Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site (C) All the adsorption does not take place by the same mechanism (D) Extent of adsorption is more than one complete monomolecular layer on the surface

2. The half-life period of a first order reaction is given by (where k = rate constant).
(A) 1.5 k
(B) 2.5 k
(C) 0.693/k
(D) 6.93 k

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