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प्रश्न
What is observed when hot, concentrated caustic soda solution is added to zinc? Write a balanced equation.
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उत्तर
\[\ce{Zn + \underset{concentrated}{\underset{Hot and}{2NaOH}}-> \underset{(colourless)}{\underset{Sodium zincate}{Na2ZnO2}} + H2\uparrow}\]
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संबंधित प्रश्न
Identify the cations in the following case:
NaOH solution, when added to the Solution (A), gives a reddish brown precipitate
Distinguish by adding:
(a) sodium hydroxide solution and
(b) Ammonium hydroxide solution to
(i) Calcium salt solution and lead salt solution
(ii) Lead salt solution and ferrous salt solution
(iii) copper salt solution and ferrous salt solution
(iv) Fe (II) salt solution and Fe (III) Salt solution
(v) Ferrous nitrate and lead nitrate
Name a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
State what do you observe when:
Neutral litmus solution is added to alkaline solution
Identify the substance Q based on the information given below:
The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with 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) |
State your observation of the following case :
When excess sodium hydroxide is added to calcium nitrate solution
Distinguish by adding:
Sodium hydroxide solution and ammonium hydroxide solution to ferrous nitrate and lead nitrate.
Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solutions in excess, except:
Write the word equation when ammonium salt is heated with caustic soda solution.
