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प्रश्न
On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (Choose from Na, l, Zn, Pb, Fe)
(a) Which metal salt solution was used?
(b) What is the formula of white gelatinous precipitate obtained?
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उत्तर
(a) Zinc (Zn ) metal salt solution was used.
(b) The formula of white gelatinous precipitate is Zn(OH)2.
Concept Insight :
\[\ce{\underset{\text{Colourless}}{ZnSO4} + 2NH4OH ->\underset{\text{White ppt.}}{Zn(OH)2} + (NH4)2SO4}\]
With excess of NH4OH the oreciojtate of zinc(II) hydroxide dissolves as:
\[\ce{Zn(OH)2 +\underset{\text{In excess}}{(NH4)2SO4 + 2NH4OH} ->\underset{\text{Tetrammine zinc(II)Sulphate(Colourless solution)}}{[Zn(NH3)4]SO4}+ 4H2O}\]
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संबंधित प्रश्न
Write the probable colour of the following salt:
Ferrous salts
Write the probable colour of the following salt:
Ammonium salts
Write the probable colour of the following salt:
Aluminium Salts
Write the probable colour of the following salt:
Potassium nitrate
Write the probable colour of the following salt:
Ferrous sulphate
Write balanced equation for the following reaction:
Iron(II) chloride solution with sodium hydroxide solution.
Write balanced equation for the following reaction:
Chlorine and cold dilute sodium hydroxide solution.
Write balanced equation for the following reaction:
Zinc and sodium hydroxide solution
The questions (i) to (v) refer to the following salt solutions listed A to F:
- Copper nitrate
- Iron (II) sulphate
- Iron (III) chloride
- Lead nitrate
- Magnesium sulphate
- Zinc chloride
- Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
- Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution ?
- Which solution will give a white precipitate, when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
- Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it ?
- Which solution gives a white precipitate with excess ammonium hydroxide solution?
Name the probable cation present based on the following observation:
White precipitate insoluble in NH4OH but soluble in NaOH.
