In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?
Electrochemistry · Class 12 · JEE Main Previous Year Question
In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?
- a
- b✓
NaOH
- c
Na metal
- d
NaOH
Strategy: Identify industrial electrochemical pro\cesses (like the chlor-alkali pro\cess) and their major products and byproducts.
Brine Electrolysis (Chlor-Alkali Pro\cess): When an aqueous solution of sodium chloride (brine) is electrolyzed:
- At the Anode: Chlorine gas is produ\ced ().
- At the Cathode: Water is redu\ced to produ\ce Hydrogen gas ().
- In the Solution: is formed.
Among the options:
- NaOH production is the primary industry where molecular hydrogen is obtained as a significant byproduct.
- and are made via the Solvay pro\cess (chemical, not electrochemical).
- Na metal requires the electrolysis of molten (Downs pro\cess), which does not involve water and thus produ\ces no hydrogen.
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