Question

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Answer 1

The reaction of AgNO3 with H2S can be represented as follows:
             

2AgNO3 + H2S → Ag2S + 2HNO3
     

Here, 1 mole of  H2S reacts with 2 moles of AgNO3 

Hence,
     

The ratio of amount of  H2S required to precipitate all the metal ions from 100 mL 1M AgNO3 is,
              

1 H2S : 2 AgNO3

The reaction of CuSO4 with H2S can be represented as follows:
              

CuSO4 + H2S → CuS + H2SO4
     

Here, 1 mole of  H2S reacts with 1 mole of CuSO4 

Hence,
     

The ratio of amount of  H2S required to precipitate all the metal ions from 100 mL 1M CuSO4 is,
             

1 H2S : 1 CuSO4