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प्रश्न
Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions.
- When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.
- The addition of dilute hydrochloric acid to B produces a gas which turns lead acetate black on paper.
- When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.
- When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.
- The addition of dilute hydrochloric acid to E produces effervescence. The gas produced turns lime water milky but does not affect acidified potassium dichromate solution.
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उत्तर
| Salt | Anion |
| A | Chloride (Cl−) |
| B | Sulphide (S2−) |
| C | Nitrate \[\ce{(NO^-3)}\] |
| D | Sulphite \[\ce{(SO^{2−}3)}\] |
| E | Carbonate \[\ce{(CO^{2-}3)}\] |
संबंधित प्रश्न
Explain how anhydrous copper sulphate can be used to detect the presence of moisture (water) in a liquid
The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
(a) potassium sulphate
(b) sodium sulphate
(c) sodium chloride
(d) potassium carbonate
The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is:
(a) KCl
(b) K2SO4
(c) K2CO3
(d) KNO3
How many molecules of water of crystallisation (per formula unit) are present in:
copper sulphate crystals?
name two salts which are basic.
Taking sodium carbonate as an example, give the meaning of the following terms:
Anhydrous
State what would you observe when :
The salt ferric chloride is exposed to the atmosphere.
Name two carbonates which do not produce carbon dioxide on heating.
Copy and complete the following table which refers to the action of heat on some carbonates:
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | |
| Lead carbonate | |
| Copper carbonate |
Distinguish by a chemical test sodium carbonate and sodium sulphite.
