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NCERT Class XII Chemistry
Chapter - Surface Chemistry
Questions with Solutions

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Question : 19 of 35
Marks: +1, -0
Give four examples of heterogeneous catalysis.
Solution:  
(a) CH2=CH2(g)+H2(g)→PtCH3−CH3(g)\mathrm{CH}_2=\mathrm{CH}_{2(g)}+\mathrm{H}_{2(g)}\xrightarrow{\mathrm{Pt}}\mathrm{CH}_3-\mathrm{CH}_{3(g)}
(b) N2(g)+3H2(g)→Fe2NH3(g)\mathrm{N}_{2(g)}+3\mathrm{H}_{2(g)}\xrightarrow{\mathrm{Fe}}2\mathrm{NH}_{3(g)}
(c) CO(g)+2H2(g)→ZnO+Cr2O3CH3OH(l)\mathrm{CO}_{(g)}+2\mathrm{H}_{2(g)}\xrightarrow{\mathrm{ZnO}+\mathrm{Cr}_2\mathrm{O}_3}\mathrm{CH_3OH}_{(l)}
(d) 2SO2(g)+O2(g)→Pt2SO3(g)2\mathrm{SO}_{2(g)}+\mathrm{O}_{2(g)}\xrightarrow{\mathrm{Pt}}2\mathrm{SO}_{3(g)}
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