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Question

# A current of electricity is passed through copper voltameter and a water voltameter connected in series. If the copper of the copper voltameter now weighs 16 mg less, hydrogen liberated at the cathode of the water voltameter measures about (at STP)

A
4.0 ml
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B
5.6 ml
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C
6.4 ml
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D
8.4 ml
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Solution

## The correct option is B 5.6 mlIt is given that copper of the copper voltameter weighs 16 mg less after electricity is passed.Moles of Cu2+ used =16×10−364=0.25×10−3Number of equivalents of Cu2+=2×0.25×10−3=0.5×10−3Number of equivalents of electrons =0.5×10−32H++2e−→H22× Moles of H2=0.5×10−3∴ Moles of H2=0.52×10−3 moles1 mole of H2 at STP has volume of 22.4 L.0.25×10−3 moles has volume =22.4×0.25×10−3 L =5.6 mL

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