Question

Oxyacids of phosphorous and the starting materials for their preparation are given below.

Oxyacid	Materials for preparation
(A) $H_{3}P{O}_2$	(i) Red P + alkali
(B) $H_{3}P{O}_3$	(ii) $P_4{O}_{10}$ + $H_{2}O$
(C) $H_{3}P{O}_4$	(iii) $P_2{O}_3$ + $H_{2}O$
(D) $H_4{P}_2{O}_6$	(iv) White P + alkali

Choose the correct answer from the codes given below:

• A. (A)-(iv);(B)- (iii); (C) - (ii); (D) - (i)
• B. (A)-(i);(B)-(iii);(C)-(ii);(D)-(iv)
• C. (A)-(iv);(B)-(iii);(C)-(i);(D)-(ii)
• D. (A)-(ii);(B)-(iii);(C)-(i);(D)-(iv)

Answer 1

Answer: (A)

(A)-(iv);(B)- (iii); (C) - (ii); (D) - (i)

Different acids of phosphorous have different methods of preparation.

$\left(i\right)$ $White$ $P+Alkali$ produces $H_{3}P{O}_2$

$\left(ii\right)$ $P_2{O}_3+3H_{2}O⟶2H_{3}P{O}_3$ (Phosphorus acid)

$\left(iii\right)$ $P_4{O}_{10}+6H_{2}O⟶4H_{3}P{O}_4$ (Phosphoric acid)

$\left(iv\right)$ $Red$ $P+Alkali$ produces $H_4{P}_2{O}_6$