Question

Match List-I with List-II

	List-I		List-II
	Name of oxo acid		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 :

• A. (a)-(v), (b)-(i), (c)-(ii), (d)-(iii)
• B. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
• C. (a)-(iv), (b)-(v), (c)-(ii), (d)-(iii)
• D. (a)-(v), (b)-(iv), (c)-(ii), (d)-(iii)

Answer 1

Answer: (A)

(a) Hypophosphorus acid : $H_3\underline{P}{O}_2$

$(+1)3+x+(-2)2=0$

$x=+1$

(b) Orthophosphoric acid : $H_3{\underline{PO}}_4$

$(+1)3+x+(-2)4=0$

$x=+5$

(c) Hypophosphoric acid : $H_4{P}_2{O}_6$

$(+1)4+2x+(-2)6=0$

$x=+4$

(d) Orthophosphorous acid : $H_{3}P{O}_3$

$(+1)3+x+(-2)3=0$

$x=+3$