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Answer questions 29, 30 and 31 by appropriately matching the information given in the three columns of the following table.
| Column - 1 | Column - 2 | Column - 3 |
|---|---|---|
| (I) | (i) | (P) Disproportionation reaction takes place |
| (II) HCHO | (ii) Conc. | (Q) Colourless and acidic gas is formed |
| (III) | (iii) | (R) Sweet fruity smell is observed |
| (IV) | (iv) | (S) Colourless and neutral gas is formed |
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