Which among the following can be used to remove sulphur dioxide gas during the purification of hydrogen gas?
A
Silver nitrate solution
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B
Lead nitrate solution
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C
Dry gas
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D
Caustic potash solution
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Solution
The correct option is D Caustic potash solution Hydrogen gas prepared in laboratory contains impurities like SO2, CO2 and NO2 as impurities. Sulphur dioxide can be removed by passing it through the caustic potash solution. SO2(g)+2KOH(aq)⟶K2SO3(aq)+H2O(l)