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Sulphides of which of the following metal ions do not form black precipitate?

Options

  1. AHg ²⁺ and Co ²⁺
  2. BCd ²⁺ and Sb ³⁺
  3. CNi ²⁺ and Ag ⁺
  4. DCo ²⁺ and Cu ²⁺

Correct answer

B. Cd ²⁺ and Sb ³⁺

Step-by-step solution

CdS yellow ; Sb ₂ ~S ₃ orange

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