Discussion
Identify A, B, C and D in the following table :
| Name of the salt | Salt obtained from | |
|---|---|---|
| Acid | Base | |
| Ammonium chloride | HCl | A |
| Sodium nitrate | HNO3 | B |
| Sodium chloride | C | D |
Choose the correct option.
Answer: C
The correct set is A - \(\mathrm{NH_{3}}\); B - NaOH; C - HCl; D - NaOH.
A salt is formed when an acid reacts with a base. Ammonium chloride comes from HCl and ammonia, \(\mathrm{NH_{3} + HCl \rightarrow NH_{4}Cl}\). Sodium nitrate comes from nitric acid and sodium hydroxide, and sodium chloride from hydrochloric acid and sodium hydroxide.
Each other option has an error. The first gives \(\mathrm{Na(OH)_{2}}\), which does not exist because sodium has a valency of 1, and NaH, a hydride rather than the base that gives sodium chloride. The second gives \(\mathrm{NH_{4}}\), which on its own is an ion, not a base. The fourth gives NaO, which is not a real compound. Only the third gets all four right, with ammonia acting as the base.
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