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A solution when diluted with H ₂ O and boiled, it gives a white precipitate. On addition of excess NH ₄ Cl / NH ₄ OH , the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in NH ₄ OH / NH ₄ Cl .

Options

  1. AZn ( OH )₂
  2. BAl ( OH )₃
  3. CMg ( OH )₂
  4. DCa ( OH )₂

Correct answer

A. Zn ( OH )₂

Step-by-step solution

A solution of Zn ²⁺ ion reacts with water which on boiling give white ppt. of Zn ( OH )₂ . This precipitates dissolve in excess of NH ₄ OH in presence of NH ₄ Cl because Zn ( OH )₂ on reaction with NH ₄ OH in presence of NH ₄ Cl forms tetrammine zinc (II) complex (soluble).

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