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Answer -
(a) Activity of acatalyst:
The activity of a catalyst is itsability to increase the rate of a particular reaction. Chemisorption is themain factor in deciding the activity of a catalyst. The adsorption of reactantson the catalyst surface should be neither too strong nor too weak. It shouldjust be strong enough to make the catalyst active.
(b) Selectivity of thecatalyst:
Theability of the catalyst to direct a reaction to yield a particular product isreferred to as the selectivity of the catalyst. For example, by using differentcatalysts, we can get different products for the reaction between H2 andCO.(i)
(ii)
(iii)