The correct Answer is A-1, B-2, C-3, D-4
Explanation
This question pertains to the chemical nature of substances found in insect stings and plant stings, and common remedies, specifically focusing on acids and bases.
Statement-wise Analysis
- A. Ant sting - 1. Methanoic acid:
- Correct. Ant stings contain methanoic acid, also known as formic acid, which causes the characteristic burning sensation and pain.
- B. Bee-sting - 2. Acid causing pain and irritation:
- Correct. Bee stings are acidic and cause pain and irritation. While they contain various compounds, the overall effect is acidic.
- C. Nettle sting - 3. Stinging hair injecting methanoic acid:
- Correct. Nettle leaves have stinging hairs that inject methanoic acid (formic acid) and other chemicals when touched, leading to pain and irritation.
- D. Baking soda - 4. Mild base used as a remedy:
- Correct. Baking soda (sodium bicarbonate) is a mild base. It is commonly used as a remedy for acidic stings (like bee stings or ant stings) to neutralize the acid and alleviate pain.
Key Takeaway
Insect and plant stings often involve acidic compounds like methanoic acid, and mild bases such as baking soda are used as remedies due to their neutralizing properties.