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Question

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


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

The correct option is D Electrolysis of water
Pure 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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