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JEE Advanced 2006
Exam
JEE Advanced
Year
2006
Subject
Chemistry
Chapter
Practical Chemistry

JEE Advanced 2006 · Chemistry · Practical Chemistry

A solution when diluted with H_2 O and boiled, it gives a white...

A solution when diluted with H2O\mathrm{H}_2 \mathrm{O} and boiled, it gives a white precipitate. On addition of excess NH4Cl/NH4OH\mathrm{NH}_4 \mathrm{Cl} / \mathrm{NH}_4 \mathrm{OH}, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in NH4OH/NH4Cl\mathrm{NH}_4 \mathrm{OH} / \mathrm{NH}_4 \mathrm{Cl}.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 ,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 ,

Options

  1. AZn(OH)2\mathrm{Zn}(\mathrm{OH})_2
  2. BAl(OH)3\mathrm{Al}(\mathrm{OH})_3
  3. CMg(OH)2\mathrm{Mg}(\mathrm{OH})_2
  4. DCa(OH)2\mathrm{Ca}(\mathrm{OH})_2

Correct answer

A. Zn(OH)2\mathrm{Zn}(\mathrm{OH})_2

Step-by-step solution

A solution of Zn2+\mathrm{Zn}^{2+} ion reacts with water which on boiling give white ppt. of Zn(OH)2\mathrm{Zn}(\mathrm{OH})_2. This precipitates dissolve in excess of NH4OH\mathrm{NH}_4 \mathrm{OH} in presence of NH4Cl\mathrm{NH}_4 \mathrm{Cl} because Zn(OH)2\mathrm{Zn}(\mathrm{OH})_2 on reaction with NH4OH\mathrm{NH}_4 \mathrm{OH} in presence of NH4Cl\mathrm{NH}_4 \mathrm{Cl} forms tetrammine zinc (II) complex (soluble). 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 ,
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 ,
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