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Question: Which of the following is an example of heterogeneous catalysis?...

Which of the following is an example of heterogeneous catalysis?

A

4NH3+5O2→Pt4NO+6H2O4 \mathrm { NH } _ { 3 } + 5 \mathrm { O } _ { 2 } \xrightarrow { \mathrm { Pt } } 4 \mathrm { NO } + 6 \mathrm { H } _ { 2 } \mathrm { O }

B

2SO2+O2→NO2SO32 \mathrm { SO } _ { 2 } + \mathrm { O } _ { 2 } \xrightarrow { \mathrm { NO } } 2 \mathrm { SO } _ { 3 }

C

CH3COOCH3+H2O→HClCH3COOH+CH3OH\mathrm { CH } _ { 3 } \mathrm { COOCH } _ { 3 } + \mathrm { H } _ { 2 } \mathrm { O } \xrightarrow { \mathrm { HCl } } \mathrm { CH } _ { 3 } \mathrm { COOH } + \mathrm { CH } _ { 3 } \mathrm { OH }

D

C12H22O11+H2O→H2SO4C6H12O6+C6H12O6\mathrm { C } _ { 12 } \mathrm { H } _ { 22 } \mathrm { O } _ { 11 } + \mathrm { H } _ { 2 } \mathrm { O } \xrightarrow { \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } } \mathrm { C } _ { 6 } \mathrm { H } _ { 12 } \mathrm { O } _ { 6 } + \mathrm { C } _ { 6 } \mathrm { H } _ { 12 } \mathrm { O } _ { 6 }

Answer

4NH3+5O2→Pt4NO+6H2O4 \mathrm { NH } _ { 3 } + 5 \mathrm { O } _ { 2 } \xrightarrow { \mathrm { Pt } } 4 \mathrm { NO } + 6 \mathrm { H } _ { 2 } \mathrm { O }

Explanation

Solution

This is an example of heterogeneous catalysis as the catalyst is present in different phase than that of the reactants.

4NH3( g)+5O2( g)→NO(s)4NO(g)+6H2O(g)4 \mathrm { NH } _ { 3 ( \mathrm {~g} ) } + 5 \mathrm { O } _ { 2 ( \mathrm {~g} ) } \xrightarrow { \mathrm { NO } _ { ( \mathrm { s } ) } } 4 \mathrm { NO } _ { ( \mathrm { g } ) } + 6 \mathrm { H } _ { 2 } \mathrm { O } _ { ( \mathrm { g } ) }

Following reactions are the examples of homogeneous catalysis as the catalyst and the reactant are in same phase.

2SO2( g)+O2( g)→NO(g)2SO3( g)2 \mathrm { SO } _ { 2 ( \mathrm {~g} ) } + \mathrm { O } _ { 2 ( \mathrm {~g} ) } \xrightarrow { \mathrm { NO } _ { ( \mathrm { g } ) } } 2 \mathrm { SO } _ { 3 ( \mathrm {~g} ) }