Match List I with List II and select the correct answer using the code given below the Lists :
| List I (Element) | List II (Highest Valency) |
| A. Sulfur | 1. Five |
| B. Phosphorous | 2. Six |
| C. Lead | 3. Two |
| D. Silver | 4. Four |
Code :
| A | B | C | D | |
| (a) | 2 | 4 | 1 | 3 |
| (b) | 2 | 1 | 4 | 3 |
| (c) | 3 | 1 | 4 | 2 |
| (d) | 3 | 4 | 1 | 2 |
2, 4, 1, 3
2, 1, 4, 3
3, 1, 4, 2
3, 4, 1, 2
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2016
– Sulfur (S): Can exhibit +6 (e.g., in sulfates), so highest valency is Six (2).
– Phosphorus (P): Can exhibit +5 (e.g., in phosphates), so highest valency is Five (1).
– Lead (Pb): Can exhibit +4 (e.g., PbO₂), so highest valency is Four (4).
– Silver (Ag): The most common valency/oxidation state is +1. While higher, unstable oxidation states exist, +1 is the standard. The option provides ‘Two’ (3) as the highest valency for Silver. Assuming this option set is intended, the pairings match option B for A, B, and C.