Question
Write the correct answer in blank circles.



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| Column I | Column II |
| 1. Oils and fats are allowed to stand in air for a long time | (a) Slow reaction |
| 2. $NaOH$ dissolves in water | (b) Rancid |
| 3. Zinc is added to $CuSO _4$ solution | (c) Exothermic reaction |
| 4. Rusting of water | (d) Colourless Solution |
