Question:
Match List-I with List-II :
Choose the correct answer from the options given below:
Correct Option: 1
Solution:
(a) Hypophosphorus acid : $\mathrm{H}_{3} \mathrm{PO}_{2}(+1) 3+x+(-2) 2=0$
$x=+1$
(b) Orthophosphoric acid: $\mathrm{H}_{3} \underline{\mathrm{PO}}_{4}$
$(+1) 3+x+(-2) 4=0$
$x=+5$
(c) Hypophosphoric acid: $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}(+1) 4+2 x+(-2) 6=0$
$x=+4$
(d) Orthophosphorous acid: $\mathrm{H}_{3} \mathrm{PO}_{3}$
$(+1) 3+x+(-2) 3=0$
$x=+3$