Question

In which of the following reactions heterogeneous catalysis involved ?
(i) 2SO₂(g) + O₂(g)→2SO₂(g)
(ii) 2SO₂(g)→2SO₃(g)
(iii) N₂(g) + 3H₂(g)→2NH₃(g)
(iv) CH₃COOCH₃(l) + H₂O(l) HCI → CH₃COOH(aq) + CH₃OH(aq) 
(a) (ii), (iii) 
(b) (ii), (iii), (iv)
(c) (i), (ii), (iii) 
(d) (iv) 

Answer 1

(a) In reaction (ii) and reaction (iii), catalysts are in solid state, and reactants and products are gases.