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4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H⁺ ions in solution by the same quantity of electric charge will be

1. 44.8 L
2. 22.4 L
3. 11.2 L
4. 5.6 L

Correct answer: 11.2 L

Solution

The equivalent weight of Al is 9 (27/3). For 4.5 g of Al, 4.5/9 = 0.5 equivalents of charge are used. The same charge will produce 0.5 equivalents of H₂ gas. At STP, 1 equivalent of H₂ gas is 22.4 L, so 0.5 equivalents will be 11.2 L.

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