Single Choice

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:

A$$KClO_{3}$$ and $$NaClO_{3}$$
B$$MnO_{2}$$ and $$Ca(OCl)_{2}$$
Correct Answer
C$$MnO_{2}$$ and $$KClO_{3}$$
D$$MnCl_{4}$$ and $$COCl_{2}$$

Solution

Bleaching agent is $$Ca(OCl)_2$$. Black powder + $$HCl$$ $$MnO_2$$ $$conc.$$ $$\downarrow$$ $$Cl_2+MnCl_2+H_2O$$ greenish yellow $$\downarrow$$ $$2Ca(OH)_2$$ $$Ca(OCl)_2+H_2O+CaCl_2$$ white powder

SIMILAR QUESTIONS

p - block Elements

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

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

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Chlorine gas bleaches moist litmus paper.

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Yellow color of chlorine water fades because of?

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

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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.

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Bleaching action of chlorine is by:

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Bleaching powder is prepared from:

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