Which one is false in the following statement? (a) A catalyst is specific in its action (b) A ve...

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Which one is false in the following statement?
(a) A catalyst is specific in its action
(b) A very small amount of the catalyst alters the rate of a reaction
(c) The number of free vacancies on the surface of the catalyst increases on sub-division
(d) \( \mathrm{Ni} \) is used as a catalyst in the manufacture of ammonia
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