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Question
CBSEENCH12011096
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The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be

  • 5.4 g

  • 10.8 g

  • 54.0 g

  • 108 g

Solution

D.

108 g

Since, 22400 mL volume is occupied by 1 mole of O2 STP.
Thus, 5600 mL of O2 means = 
5600 over 22400 space m o l space O subscript 2 space equals space 1 fourth space m o l space O subscript 2 therefore space W e i g h t space o f space O subscript 2 space equals space 1 fourth space x 32 space equals space 8 space g A c c o r d i n g space t o space p r o b l e m comma E q u i v a l e n t space o f space A g space equals space E q u i v a l e n t space o f space O subscript 2 space equals space fraction numerator W e i g h t space o f space A g over denominator E q u i v a l e n t space W e i g h t space o f space A g end fraction equals fraction numerator W subscript O subscript 2 end subscript over denominator E q u i v a l e n t space w e i g h t space o f space O subscript 2 end fraction fraction numerator W subscript A g end subscript over denominator M subscript A g end subscript space end fraction space equals space W subscript O subscript 2 end subscript over M subscript O subscript 2 end subscript therefore space W subscript A g end subscript over 108 x space 1 space equals space 8 over 32 space x space 4 left square bracket therefore 2 H subscript 2 O space rightwards arrow straight O subscript 2 space plus 4 straight H to the power of plus space plus 4 straight e to the power of minus right square bracket straight W subscript Ag space equals space 108 space straight g

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