Q.

The mass of copper that will be deposited at cathode in electrolysis of 0.2 M solution of copper sulphate when a quantity of electricity equal to that required to liberate 2.24 L of hydrogen from 0.1 M aqueous H2SO4 is passed (atomic mass of Cu = 63.5) will be

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answer is 6.35.

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Detailed Solution

1F=1Eq of H2=11.2L of H211.2L of H2=1Eq of H22.24L of H2=2.2411.2=0.2Eq∴0.2Eq of Cu will be deposited. 1Eq of Cu=63.52g0.2Eq of Cu=63.52×0.2=6.35g
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The mass of copper that will be deposited at cathode in electrolysis of 0.2 M solution of copper sulphate when a quantity of electricity equal to that required to liberate 2.24 L of hydrogen from 0.1 M aqueous H2SO4 is passed (atomic mass of Cu = 63.5) will be