In which of the following reactions, there is no change in valency?

Options

A. `SO_(2)+2H_(2)Sto2H_(2)O+3S`
B. `2Na+O_(2)toNa_(2)O_(2)`
C. `Na_(2)O_(2)+H_(2)SO_(4)toNa_(2)SO_(4)+H_(2)O_(2)`
D. `4KClO_(3)to3KClO_(4)+KCl`

Answer

C

Explanation

a. `overset(+4)(S)O_(2)+2H_(2)overset(-2)(S)to2H_(2)O+3overset(0)(S)`
b. `2overset(0)(Na)+overset(0)(O_(2))to2overset(+1)(Na_(2))overset(-1)(O_(2))`
c. `2overset(+1)(Na_(2))overset(-1)(O_(2))+H_(2)SO_(4)tooverset(+1)(Na_(2))SO_(4)`
`+H_(2)overset(-1)(O_(2))` (no change in ON)
d. `4Koverset(+5)(Cl)O_(3)to3Koverset(+7)(Cl)O_(4)+Koverset(-1)(Cl)`