In which of the following reactions heterogeneous catalysis is involved? (i) `2SO_(2)(g)+O_(2)(g) overset(NO(g))(to) 2SO_(3)(g)` (ii) `2SO_(2)(g) overset(Pt(s))(to) 2SO_(3)(g)` (iii) `N_(2)(g)+3H_(2)(g) overset(Fe(s))(to) 2NH_(3)(g)` (iv) `CH_(3)COOCH_(3)(l)+H_(2)O(l) overset(HCl(l))(to)CH_(3)COOH(aq)+CH_(3)OH(aq)`A. (ii), (iii)B. (ii), (iii) and (iv)C. (i), (ii) and (iii)D. (iv)

In which of the following reactions heterogeneous catalysis is involve

1.	In which of the following reactions heterogeneous catalysis is involved? (i) `2SO_(2)(g)+O_(2)(g) overset(NO(g))(to) 2SO_(3)(g)` (ii) `2SO_(2)(g) overset(Pt(s))(to) 2SO_(3)(g)` (iii) `N_(2)(g)+3H_(2)(g) overset(Fe(s))(to) 2NH_(3)(g)` (iv) `CH_(3)COOCH_(3)(l)+H_(2)O(l) overset(HCl(l))(to)CH_(3)COOH(aq)+CH_(3)OH(aq)`A. (ii), (iii)B. (ii), (iii) and (iv)C. (i), (ii) and (iii)D. (iv)
Answer» Correct Answer - C (i) Reaction in which catalyst is in different phase than other (reactants and products ) is known as heterogeneous catalysis. (ii) `2SO_(2)(g) overset(Pt(s))(to) 2SO_(3)(g)` Here, reactant `SO_(2)` and product `SO_(3)` are in gaseous phase while platinum is in solid phase. So, this reaction represents a heterogeneous catalysis. (iii) `N_(2)(g)+3H_(2)(g) overset(Fe(s))(to) 2NH_(3)(g)` Similarly, here `N_(2)` and `H_(2)` reactants are in gaseous phase while `NH_(3)` is in solid phase. Whereas in other reactions catalyst is in same phase with reactant(s) and product(s).