Correct Option
The correct option is A-1, B-2, C-3, D-4.
Explanation
Substances are classified as acidic, basic, or neutral according to their chemical nature and their effect on indicators.
Lemon juice contains citric acid and is matched with the strongly acidic category in the given list. Curd contains lactic acid and is weakly acidic. Common salt solution is neutral in nature. Lime water is a solution of calcium hydroxide and is basic.
- A. Lemon juice — 1. Strongly acidic: Correct. Lemon juice contains citric acid and shows acidic character.
- B. Curd — 2. Weakly acidic: Correct. Curd contains lactic acid, which gives it weak acidic character.
- C. Common Salt — 3. Neutral: Correct. Common salt solution does not show acidic or basic character.
- D. Lime water — 4. Basic: Correct. Lime water contains calcium hydroxide and shows basic character.
Key Takeaway: Lemon juice and curd are acidic, common salt is neutral, and lime water is basic.