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In what order the reagents N a 2 S , N a C l and N a l are added to an aqueous solution containing Ag + , Cu + 2 and Ni + 2 ions in order to precipitate A g + first C u + 2 second and N i + 2 last.

Options

  1. AN a 2 S , N a l , N a C l
  2. BN a C l , N a 2 S , N a l
  3. CN a l , N a C l , N a 2 S
  4. DN a C l , N a l , N a 2 S

Correct answer

D. N a C l , N a l , N a 2 S

Step-by-step solution

With N a C l only A g + precipitates A g + + N a C l ↓ + N a + With N a l , C u + 2 precipitates 2 C u + 2 + 4 I - → C u 2 I 2 ↓ + I 2 With N a 2 S , N i + 2 precipitates N i + 2 + N a 2 S → N i S ↓ + 2 N a +

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