Subjective Type

Account for the following: Bleaching of flowers by chlorine is permanent while that by sulphur dioxide is temporary.

Solution

$$Cl_{2}$$ bleaches coloured material by oxidation.
$$Cl_{2} + H_{2}O\rightarrow 2HCl + O$$
Coloured material $$+ [O]\rightarrow Colourless$$
Hence, bleaching is permanent.

In contrast, $$SO_{2}$$ bleaches coloured material by reduction and hence bleaching is temporary since when the bleached colourless material is exposed to air, it gets oxidised and the colour is restored.
$$SO_{2} + 2H_{2}O\rightarrow H_{2}SO_{4} + 2H$$
$$Coloured\ material + H\rightarrow Colourless\ material \underset {oxidation}{\xrightarrow {aerial}} Colourless\ material$$.

SIMILAR QUESTIONS

p - block Elements

The reaction between $$H_{2}$$ and $$Cl_{2}$$ in direct sun light is explosive.

p - block Elements

In paper industry, the chemical compound used for bleaching is :

p - block Elements

Chlorine gas bleaches moist litmus paper.

p - block Elements

Yellow color of chlorine water fades because of?

p - block Elements

A black powder when heated with conc. HCl gives a greenish yellow gas. The gas acts as an oxidizing and a bleaching agent. When it is passed over slaked lime, a white powder is formed which is a ready source of gas. The black powder and white powder respectively are:

p - block Elements

Account for the following: a. $$BiH_{3}$$ is the strongest reducing agent in Group $$15$$ elements hydrides. b. $$Cl_{2}$$ acts as a bleaching agent. c. Noble gases have very low boiling points.

p - block Elements

On heating with bleaching powder, ethyl alcohol is converted into:

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Bleaching powder is insoluble in cold water.

p - block Elements

Bleaching action of chlorine is by:

p - block Elements

Bleaching powder is prepared from:

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