What is selectivity of the catalyst ? Give an example.

Explanation

The selectivity of a catalyst is its ability to direct a reaction to yield a particular product.
Example : With CO and `H_(2)` using different catalyst gives different products.
(1) `CO(g) + 3H_(2)(g) overset(Ni(s))rarr CH_(4)(g) + H_(2)O(g)`
(2) `CO(g) + H_(2)(g) overset(Cu)rarr HCHO(g)`.