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Q.

Which of the following is an example for heterogeneous catalysis reaction?

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a

<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub><mfenced><mi>g</mi></mfenced><mo>+</mo><msub><mi>O</mi><mn>2</mn></msub><mfenced><mi>g</mi></mfenced><mover><mo>&#x2192;</mo><mrow><mi>N</mi><mi>O</mi><mfenced><mi>g</mi></mfenced></mrow></mover><mn>2</mn><mi>S</mi><msub><mi>O</mi><mn>3</mn></msub><mfenced><mi>g</mi></mfenced></math>

b

Hydrolysis of aqueous sucrose solution in the presence of an aqueous mineral acid.

c

<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mfenced><mn>1</mn></mfenced><mover><mo>&#x2192;</mo><mrow><mi>P</mi><mi>t</mi><mfenced><mi>s</mi></mfenced></mrow></mover><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mfenced><mn>1</mn></mfenced><mo>+</mo><msub><mi>O</mi><mn>2</mn></msub><mfenced><mi>g</mi></mfenced></math>

d

Hydrolysis of liquid in the presence of aqueous mineral acid. 

answer is C.

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Detailed Solution

Usually the catalytic phase differs from the reactants or products phase.
An example of a heterosexual catalytic reaction is as follows.
<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><mfenced><mn>1</mn></mfenced><mover><mo>&#x2192;</mo><mrow><mi>P</mi><mi>t</mi><mfenced><mi>s</mi></mfenced></mrow></mover><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mfenced><mn>1</mn></mfenced><mo>+</mo><msub><mi>O</mi><mn>2</mn></msub><mfenced><mi>g</mi></mfenced></math>In this reaction the reactant is usually in the liquid phase, while the catalyst is in the solid phase and the products are in the liquid and gas phase.
In homogeneous catalysts all catalysts, reactants and products are usually found in the same phase.
 
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