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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 ml
It is given that copper of the copper voltameter weighs 16 mg less after electricity is passed.
Moles of Cu2+ used =16×10364=0.25×103

Number of equivalents of Cu2+=2×0.25×103=0.5×103

Number of equivalents of electrons =0.5×103

2H++2eH2

2× Moles of H2=0.5×103

Moles of H2=0.52×103 moles

1 mole of H2 at STP has volume of 22.4 L.

0.25×103 moles has volume =22.4×0.25×103 L =5.6 mL

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