Surface Chemistry Test - 62

Hint: Those reactions in which the catalyst exists in the same phase as reactants is called homogeneous catalysis.

Step 1: Ostwald’s Process:

In Ostwald’s process ammonia gas reacts with oxygen in the presence of platinum as a catalyst to produce nitric acid. Ammonia and oxygen both reactants are present in the gaseous phase but platinum is present in the solid phase. Thus the reactants and catalysts are present in different phases so it is an example of heterogeneous catalysis

Step 2: Lead chamber process :

In the Lead chamber process sulfuric acid is produced by oxidizing sulfur dioxide with moist air in the presence of nitrogen oxide as a catalyst. So here $$SO_2$$ is present in the gaseous phase and $$NO$$ is also present in the gas phase. Thus the reactants and catalysts are present in the same phase so it is an example of homogeneous catalysis

Step 3: Haber's process :

In Haber’s process nitrogen gas reacts with hydrogen gas in the presence of iron as a catalyst to produce ammonia. So here nitrogen and hydrogen both reactants are present in the gaseous phase but iron is present in the solid phase. Thus the reactants and catalysts are present in different phases so it is an example of heterogeneous catalysis.

Step 4: Contact process

In the Contact process, $$H_2SO_4$$ acid is produced by the reaction of sulphur dioxide in the presence of $$V_2O_5$$ as the catalyst. So here Sulphur dioxide is present in the gaseous phase and $$V_2O_5$$  is present in the solid phase. Thus the reactants and catalysts are present in different phases so it is an example of heterogeneous catalysis.

Final Step: Correct option is (B)-Lead Chamber process.