How many is the following reaction (s) have sum of co-efficient of reactants after balancing either 3 or 4.

Options

A. `FeSO_(4)toFe_(2)O_(3)+SO_(2)+SO_(3)`
B. `Br_(2)+barOHtoBrO^(-)+Br^(-)+H_(2)O`
C. `Cl_(2)+SeO_(3)^(2-)+H_(2)OtoSeO_(4)^(2-)+Cl^(-)+H^(+)`
D. `Cl_(2)+IO_(3)^(-)+OH^(-)toCl^(-)+IO_(4)^(-)+H_(2)O`

Answer

B, C, D

Explanation

`2FeSO_(4)toFe_(2)O_(3)+SO_(2)+SO_(3)`
`Br_(2)+2barO Hto BrO^(-)+Br^(-)+H_(2)O`
`Cl_(2)+SeO_(3)^(2)+H_(2)Oto SeO_(4)^(2-)+2Cl^(-)+2H^(+)`
`Cl_(2)+IO_(3)^(-)+2OH^(-)to2Cl^(-)+IO_(4)^(-)+H_(2)O`