Question

Very pure hydrogen $$(99.9\%)$$ can be made by which of the following processes?

A
Reaction of methane with steam
B
Mixing natural hydrocarbons of high molecular weight
C
Electrolysis of water
D
Reaction of salt like hydrides with water

Solution

The correct option is D Electrolysis of waterPure hydrogen can be obtained from the electrolysis of water.Cathode (reduction):  $$2H_2O_{(l)}+ 2e^− \rightarrow H_{2(g)} + 2 OH^−_{(aq)}$$Anode (oxidation):     $$4OH^−_{(aq)}\rightarrow O_{2(g)} + 2H_2O_{(l)} + 4e^−$$Combining either half reaction pair yields the same overall decomposition of water into oxygen and hydrogen:Overall reaction: $$2H_2O_{(l)} \rightarrow 2H_{2(g)} + O_{2(g)}$$The number of hydrogen molecules produced is thus twice the number of oxygen molecules.Chemistry

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