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Q.

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

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a

CO2 and Cl2,

b

NH3, and SO3,

c

H2S and Br2,

d

SO2 and Cl2,

answer is D.

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Detailed Solution

Aqueous solution of SO2, acts as reducing agentSO2+2H2O⟶H2SO4+2[H] thus SO2in presence of moisture is used as bleaching agent. This is due to the reducing nature of SO2Coloured compound + [H] → Colourless compound Bleaching action of Cl2, is due to oxidizing nature

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