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Question
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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Solution
| Salt | Anion |
| A | Chloride (Cl−) |
| B | Sulphide (S2−) |
| C | Nitrate \[\ce{(NO^-3)}\] |
| D | Sulphite \[\ce{(SO^{2−}3)}\] |
| E | Carbonate \[\ce{(CO^{2-}3)}\] |
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