Question
The correct statement(s) related to oxoacids of phosphorous is(are)
JEE Advanced
Chemistry
p Block Elements (Group 15, 16, 17 & 18)
2021
JEE Advanced 2021 (Paper 2)
JEE Advanced Chemistry Question (2021) — Solution
Options
- A. Upon heating, H 3 PO 3 undergoes disproportionation reaction to produce H 3 PO 4 and PH 3 .
- B. While H 3 PO 3 can act as reducing agent, H 3 PO 4 cannot.
- C. H 3 PO 3 is a monobasic acid.
- D. The H atom of P - H bond in H 3 PO 3 is not ionizable in water.
Answer
D. The H atom of P - H bond in H 3 PO 3 is not ionizable in water.
Step-by-step solution
4 H 3 PO 3 → ∆ 3 H 3 PO 4 + PH 3 (Disproportionation) Oxidation state of ' P ' in H 3 PO 4 is + 5 which is maximum oxidation state of ' P ' so H 3 PO 4 cannot act as a reducing agent whereas H 3 PO 3 can act as a reducing agent because the oxidation state is + 3 and it can increase upto + 5 . ⇒ H 3 PO 3 : It is dibasic acid. ⇒ Only H - atom attached with ' O ' is ionizable.
Related: Chemistry — p Block Elements (Group 15, 16, 17 & 18) · All PYQ Banks