Match the following and choose the correct option.
| Compound | Uses |
| (a) Bleaching powder | (i) plaster for supporting fractured bones in the right position. |
| (b) Baking soda | (ii) in removing permanent hardness of water |
| (c) Washing soda | (iii) to neutralize excess acid in the stomach and provide relief |
| (d) Plaster of Paris | (iv) to make drinking water free from germs |
Answer & explanation
Correct answer: option 3
The correct answer is option 3. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i).
Here's the explanation for each match:
(a) Bleaching powder (CaOCl₂): Used as a disinfectant and bleaching agent, not for setting bones (iv).
(b) Baking soda (NaHCO₃): Commonly used as an antacid to neutralize stomach acid (iii).
(c) Washing soda (Na₂CO₃): Effective in removing water hardness (ii).
(d) Plaster of Paris (CaSO₄·½H₂O): Primarily used for making casts and molds, including those supporting broken bones (i).
Therefore, option 3 correctly matches the compounds with their respective uses.