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प्रश्न
Name the chloride of a metal which is soluble in excess of ammonium hydroxide. Write equation for the same.
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उत्तर १
Zinc chloride (ZnCl2) is soluble in excess of ammonium hydroxide.
\[\ce{\underset{\text{colourless}}{ZnCl2} + 2NH4OH -> \underset{\text{white gelatinous ppt.}}{Zn(OH)2↓} + 2NH4Cl}\]
With excess of NH4OH ppt dissolves
\[\ce{Zn(OH)2 + 2NH4Cl + 2NH4OH(excess) -> \underset{\text{Tetrammine zinc(ll)chloride colourless}}{[Zn(NH3)4]Cl2 + 4H2O}}\]
उत्तर २
It is silver chloride [AgCl] dissolves in excess of NH4OH.
A product formed is [Ag(NH3)2]Cl [Soluble colourless Diamine Argentous (Z) chloride]
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संबंधित प्रश्न
Identify the substance underlined, in the following case:
Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide.
Name the kind of particles present in sodium hydroxide solution.
What do you observe when caustic soda solution is added to the following solution, first a little and then in excess:
FeCl3
Write a balanced equation for this reaction.
Name a yellow monoxide that dissolves in hot and concentrated caustic alkali.
What do you observe when ammonium salt is heated with caustic soda solution?
Using sodium hydroxide solution, how will you distinguish:
Iron (II) chloride from iron (III) chloride
Sodium hydroxide solution is added to solution A. A white precipitate is formed which is soluble in excess sodium hydroxide. Name the metal ion present in A.
Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively. Each solution is divided into two portions (i) and (ii). Describe the effect of
- adding sodium hydroxide solution to each portion in turn till it is in excess.
- adding ammonium hydroxide to each portion in turn till it is in excess.
Sodium hydroxide solution is added to the solutions containing the ions mentioned in List X. List Y gives the details of the precipitate. Match the ions with their coloured precipitates.
| List X | List Y |
| (i) Pb2+ | (A) Reddish Brown |
| (ii) Fe2+ | (B) White insoluble inexcess |
| (iii) Zn2+ | (C) Dirty green |
| (iv) Fe3+ | (D) White soluble in excess |
| (v) Cu2+ | (E) White soluble in excess |
| (vi) Ca2+ | (F) Blue |
What is observed when hot, concentrated caustic soda solution is added to zinc? Write a balanced equation.
