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Question

Same amount of electric current is passed through solutions of AgNO3 and H2O. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated at S.T.P. in the second case is:

A
224 cm3
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B
1.008g
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C
112 cm3
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D
22400 cm3
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Solution

The correct option is B 112 cm3
The molar mass of Ag is 108 g/mol.
Let n be the number of moles of hydrogen liberated
Ag++eAg
2H++2eH2
Thus 1 mole of hydrogen corresponds to 2 moles of silver.
Number of moles of hydrogen liberated
1.08108=2×n

n=0.005
At S.T.P, 1 mole of hydrogen occupies a volume of 22400cm3
0.005 moles of hydrogen will occupy a volume of 0.005×22400=112cm3

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