Paragraph: When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N , the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O . Addition of aqueous NH ₃ dis

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Paragraph: When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N , the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O . Addition of aqueous NH ₃ dissolves O and gives an intense blue solution. Question: The final solution contains

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Correct answer: C. [ Ag ( NH ₃ )₂ ]⁺ and [ Co ( NH ₃ )₄ ]²⁺

Since in the beginning, concentrated AgNO ₃ solution was taken, some AgNO ₃ remain in solution which gives white precipitate of AgCl on addition of NaCl . The precipitate finally dissolve in ammonia and Cu ²⁺ present in solution also forms complex with ammonia as

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