One gas bleaches the colour of flowers by reduction, while the other by oxidation, the two gases respectively are:

Options

A. `CO and Cl_(2)`
B. `H_(2)S and Br_(2)`
C. `NH_(3) and SO_(3)`
D. `SO_(2) and Cl_(2)`

Answer

D

Explanation

Aqueous solution off `SO_(2)` acts as a reducing agent.
`SO_(2)+2H_(2)O to H_(2)SO_(4)+underst("nascent hydrogen")(2H)`
Thus, `SO_(2)` in presence of moistuure is used as bleaching as bleaching agent. This is due to the reducing nature of `SO_(2)`.
for delicate articles.
Coloured matter`+Hto`Colourless matter
similarly, `Cl_(2)`acts as bleaching agent in presence of moisture
`Cl_(2)+H_(2)O to 2HCl+[O]`
coloured matter`+[O]to`Colourless matter.