Ncert Exercises & Solutions

In which of the following reactions heterogeneous catalysis is involved ?

$(i) 2 S O_{2} (g) + O_{2} (g) \overset{N O (g)}{\to} 2 S O_{3} (g)$ $(i) 2 S O_{2} (g) + O_{2} (g) \overset{N O (g)}{\to} 2 S O_{3} (g)$

$(i i) 2 S O_{2} (g) \overset{P t (s)}{\to} 2 S O_{3} (g)$ $(i i) 2 S O_{2} (g) \overset{P t (s)}{\to} 2 S O_{3} (g)$
$(i i i) N_{2} (g) + 3 H_{2} (g) \overset{F e (s)}{\to} 2 N H_{2} (g)$ $(i i i) N_{2} (g) + 3 H_{2} (g) \overset{F e (s)}{\to} 2 N H_{2} (g)$
$(i v) C H_{3} C O O C H_{3} (l) + H_{2} O (l) \overset{C H (l)}{\to}$ $(i v) C H_{3} C O O C H_{3} (l) + H_{2} O (l) \overset{C H (l)}{\to}$
$C H_{3} C O O C H (a q) + C H_{3} O H (a q)$ $C H_{3} C O O C H (a q) + C H_{3} O H (a q)$

1. (ii), (iii)

2. (ii), (iii) and (iv)

3. (i), (ii) and (iii)

4. (iv)

NEETprep Answer:

(i) Reaction in which catalyst is in a different phase than other (reactants and products) is known as heterogeneous catalysis.

(ii)

2 S O_{2} (g) \overset{P t (s)}{\to} 2 S O_{3} (g)

$2 S O_{2} (g) \overset{P t (s)}{\to} 2 S O_{3} (g)$
Here, reactant SO, and product SQ, are in gaseous phase while platinum is in solid phase. So, this reaction represents a heterogeneous catalysis.

(iii)

N_{2} (g) + 3 H_{2} (g) \overset{F e (s)}{\to} 2 N H_{3} (g)

$N_{2} (g) + 3 H_{2} (g) \overset{F e (s)}{\to} 2 N H_{3} (g)$

Similarly, here N₂ and H₂ reactants are in gaseous phase while NH₃ is in solid phase. Whereas in other reactions catalyst is in same phase with reactant(s) and product(s),

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