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प्रश्न
Write the observation, and balanced equation for the following reaction:
Sodium hydroxide is added dropwise to a solution of zinc sulphate, till it is in excess.
उत्तर
Sodium hydroxide when added to zinc sulphate gives gelatinous white precipitate which dissolves in excess of sodium hydroxide.
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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
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.
What do you observe when caustic soda solution is added to the following solution, first a little and then in excess:
Pb(NO3)2
Write 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?
Write equation for the reaction that will take place when copper sulphate solution is added to sodium hydroxide solution.
Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride, and iron (III) sulphate. Copy the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipitate (soluble or insoluble) in (vi) to (x).
| Aqueous salt solution | Colour of precipitate when NaOH is added in a small quantity | Nature of precipitate (soluble or insoluble) when NaOH is added in excess |
| Copper (II) sulphate | (i) | (vi) |
| Zinc nitrate | (ii) | (vii) |
| Lead nitrate | (iii) | (viii) |
| Calcium chloride | (iv) | (ix) |
| Iron (III) Sulphate | (v) | (x) |
Distinguish by adding:
Sodium hydroxide solution and ammonium hydroxide solution to calcium salt solution and lead salt solution.
Distinguish by adding:
Sodium hydroxide solution and ammonium hydroxide solution to Fe(II) salt solution and Fe(III) salt solution.
What is observed when hot, concentrated caustic soda solution is added to aluminium? Write a balanced equation.
