MCQ
Khadins, Bundhis, Ahars and Kattas are ancient structures that are examples for :
- AGrain storage.
- BWood storage.
- ✓Water harvesting.
- DSoil conservation.
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| Column $(A)$ | Column $(B)$ | ||
| $A.$ | Bleaching powder | $1.$ | Preparation of glass |
| $B.$ | Baking soda | $2.$ | Production of $H_2$ and $Cl_2$ |
| $C.$ | Washing soda | $3.$ | Decolourisation |
| $D.$ | Sodium chloride | $4.$ | Antacid |