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Electrode Potential

4.5 g of alum...

Question

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

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Solution

Step 1: Given data
Weight of Aluminium = $4.5 g$
Step 2:Calculating No. of equivalents
No.of equivalents of Aluminium deposited $= \frac{4.5}{9} = 0.5$
No.of equivalents of $H_{2}$ will also be $0.5$
Step 3: Deriving Volume of Hydrogen gas
Volume of $H_{2}$ at STP,
$= No . of equivalents x Equivalent volume = 0.5 x 11.2 = 5.6 L$

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