The ratio of the molar amounts of H₂S needed to precipitate the metal ions from 20mL each of 1 M Cd(NO₃)₂ and 0.5M CuSO₄ is [CPMT 1997]

Question: The ratio of the molar amounts of H₂S needed to precipitate the metal ions from 20mL each of 1 M Cd(NO₃)₂ and 0.5M CuSO₄ is [CPMT 1997]

(a) 1 : 1

(b) 2 : 1

(c) 1 : 2

(d) Indefinite

Correct Answer: (b) 2 : 1

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