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Question

When aqueous AgNO3 is electrolyzed using Pt electrodes, if 3.2 g of O2 is liberated at the anode, the Amount of Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)


A

32 g

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B

1.6 g

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C

4.32 g

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D

43.2 g

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Solution

The correct option is D

43.2 g


Ag++eAg;

Eq. wt of 'Ag'EAg=1081=108g (atomic mass of Ag=108)

20HO2+2H++4e;

Eq. wt of O2 Eo2 = 324=8g (Molar mass of O2=32)

When same quantity of electricity is passes

no. of eqts of 'Ag' = no. of eqts of O2

WAgEAg=WO2EO2;WAg108=3.28;WAg=43.2g


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