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A colorless water-soluble compound on strong heating liberates a brown colored gas and leaves a yellow residue that turns white on cooling. An aqueous solution of the original solid gives a white precipitate with ( NH ₄ )₂ ~S . The original solid is

Options

  1. AZn ( NO ₃ )₂
  2. BCa ( NO ₃ )₂
  3. CAl ( NO ₃ )₃
  4. DNaNO ₃

Correct answer

A. Zn ( NO ₃ )₂

Step-by-step solution

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