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Question

The ratio of amounts of H2S needed to precipitate all the metal ions from 100 ml of 1 M AgNO3 and 100 ml of 1 M CuSO4 will be

A
1 : 1
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B
1 : 2
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C
2 : 1
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D
None of these
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Solution

The correct option is B 1 : 2
AgNO3=2Ag++S2Ag2S
(H2S)
2 mole 1 mole [100×1=100 millimole]
100 miliimole 50 millimole H2S required
CuSO4CU+2+S2Cus
(H2S)
1 mole 1 mole [100×1=100 millimole]
100 miliimole 100 millimole H2S required
Ratio 50100=12

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