Match List-I with List-II and choose the correct answer from the codes given below:
| List-I | List-II |
|---|---|
| a. Magnesium oxide | 1. Amphoteric |
| b. Phosphorus pentoxide | 2. Basic |
| c. Aluminium oxide | 3. Strongly basic |
| d. Sodium oxide | 4. Acidic |
Codes:
- Aa-4, b-2, c-3, d-1
- Ba-3, b-4, c-1, d-2
- Ca-2, b-4, c-1, d-3
- Da-1, b-2, c-3, d-4
Show answer and explanation
Correct answer: (c) a-2, b-4, c-1, d-3
Explanation
The oxides of metals are basic and those of non-metals are acidic, with amphoteric oxides in between:
- (a) Magnesium oxide (MgO) → 2, basic: it forms magnesium hydroxide, a weak base.
- (b) Phosphorus pentoxide (P₂O₅) → 4, acidic: it forms phosphoric acid with water.
- (c) Aluminium oxide (Al₂O₃) → 1, amphoteric: it reacts with both acids and bases.
- (d) Sodium oxide (Na₂O) → 3, strongly basic: it forms sodium hydroxide, a strong alkali.
So the code is a-2, b-4, c-1, d-3.