Chemistry Q57 – NEET-UG 2023

Home Chemistry Chemical KineticsQuestion #277

Which one is an example of heterogeneous catalysis?

Clue 1 of 3: Understanding Catalysis

Recall the definition of heterogeneous catalysis, where the catalyst and reactants are in different physical phases.

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Ninja Strategy•Phase Mismatch Identification

Quickly identify the physical states of reactants and catalysts for each option. Heterogeneous catalysis requires different phases.

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Step 1: Define Heterogeneous Catalysis✦ Active

Heterogeneous catalysis occurs when the catalyst and the reactants are in different physical phases. For example, gaseous reactants reacting on a solid catalyst surface.

💡 Teacher's Secret Hint

Distinguish this from homogeneous catalysis where all components are in the same phase.

Step 2: Analyze Each Option for Phases○ Expand

Option (1): Oxidation of $S O_{2} (g)$ to $S O_{3} (g)$ using oxides of nitrogen ( $N O_{x} (g)$ ) as catalyst. All are gases, so it's homogeneous catalysis. Option (2): Hydrolysis of sugar (aqueous) catalysed by $H^{+} (a q)$ ions. All are in the aqueous/liquid phase, so it's homogeneous catalysis. Option (3): Decomposition of $O_{3} (g)$ in presence of $N O (g)$ . Both are gases, so it's homogeneous catalysis. Option (4): Combination of $N_{2} (g)$ and $H_{2} (g)$ to form $N H_{3} (g)$ in the presence of finely divided iron ( $F e (s)$ ). Reactants are gases, catalyst is solid.

Step 3: Conclude the Type of Catalysis○ Expand

Since the reactants ( $N_{2} (g)$ , $H_{2} (g)$ ) are in the gaseous phase and the catalyst ( $F e (s)$ ) is in the solid phase, option (4) represents heterogeneous catalysis.

💡 Teacher's Secret Hint

The Haber-Bosch process is a classic industrial example of heterogeneous catalysis.

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Chemistry Question 57 – NEET-UG 2023

Clue 1 of 3: Understanding Catalysis

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