Multiple choice

The ratio of amounts of $ H_{2}S$ needed to precipitate all the metal ions from 100 ml of $1 M \ AgNO_{3}$ and 100 ml of $ 1 M \ CuSO_{4}$ is

  1. 1:2

  2. 2:1

  3. zero

  4. infinite
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A Correct answer
Explanation

To precipitate metal ions as sulfides, the stoichiometry is Ag2S and CuS. For 0.1 moles of AgNO3, 0.05 moles of H2S are needed; for 0.1 moles of CuSO4, 0.1 moles of H2S are needed. The ratio of H2S required is 0.05:0.1, which simplifies to 1:2.

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