JEE PYQ: P Block Elements Question 2
Question 2 - 2021 (16 Mar Shift 1)
Match List-I with List-II:
| List-I (Name of oxo acid) | List-II (Oxidation state of ‘P’) | ||
|---|---|---|---|
| (a) | Hypophosphorous acid | (i) | +5 |
| (b) | Orthophosphoric acid | (ii) | +4 |
| (c) | Hypophosphoric acid | (iii) | +3 |
| (d) | Orthophosphorous acid | (iv) | +2 |
| (v) | +1 |
Choose the correct answer from the options given below:
(1) (a)-(v), (b)-(i), (c)-(ii), (d)-(iii)
(2) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
(3) (a)-(iv), (b)-(v), (c)-(ii), (d)-(iii)
(4) (a)-(v), (b)-(iv), (c)-(ii), (d)-(iii)
Show Answer
Answer: (1)
Solution
(a) Hypophosphorous acid: $\text{H}_3\text{PO}_2$; $(+1)3 + x + (-2)2 = 0$; $x = +1$. (b) Orthophosphoric acid: $\text{H}_3\text{PO}_4$; $x = +5$. (c) Hypophosphoric acid: $\text{H}_4\text{P}_2\text{O}_6$; $x = +4$. (d) Orthophosphorous acid: $\text{H}_3\text{PO}_3$; $x = +3$.
BETA
