of reaction
(c) Catalyst is required in
large quantities to catalyse reactions
(d) Catalytic activity of a solid
catalyst does not depend upon the strength of chemisorption
Answer:
(a, b)
(a) Same reactants may give different
products by using different catalysts as different catalysts have different
specific functions to mold the reaction towards specific product.
e.g., starting with Hg and CO,
and using different catalysts, we get different products.
(i) 
(ii) 
(iii) 
(b) Catalyst does not change AH of
reaction as 
of reaction is
difference between enthalpy of reactants and products. So, it does not change
during catalysed reaction.
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