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Question

The ratio of amounts of H2S needed to precipitate all, the metal ions from 100 ml of 1MAgNO3 and 100 ml of 1MCuSO4 will be:

A
1:2
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B
2:1
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C
1:1
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D
indefinite
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Solution

The correct option is B 1:2
The ratio of amounts of H2S needed to precipitate all, the metal ions from 100 ml of 1 M AgNO3 and 100 ml of 1M CuSO4 will be 1 : 2.
2AgNO3+H2SAg2S+2HNO3
100 mL of 1 M AgNO3 will require 1M×0.1L2=0.05 moles of H2S.
CuSO4+H2SCuS+H2SO4
100 mL of 1 M CuSO4 will require 1M×0.1L=0.1 moles of H2S.
The ratio of amounts of H2S needed to precipitate all, the metal ions from 100 ml of 1 M AgNO3 and 100 ml of 1M CuSO4 will be 1 : 2.

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