Which gas is utilised during the preparation of bleaching powder?

Correct option is C

Sol: The correct answer is (c) Chlorine

Key Points:

Bleaching powder, also known as calcium hypochlorite (Ca(OCl)₂), is prepared by passing chlorine gas (Cl₂) over slaked lime (calcium hydroxide, Ca (OH)₂)

The reaction is as follows:

$$Ca(OH) _2​ +Cl _2​ →Ca(OCl) _2​ +H _2​ O$$
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In this process, chlorine gas reacts with calcium hydroxide to form bleaching powder and water.

Thus, chlorine is the gas utilized in the preparation of bleaching powder.

Information booster:

Uses of Bleaching Powder:

• Disinfection:
  It is widely used for disinfecting drinking water and sanitizing pools because it releases chlorine when dissolved in water, which kills bacteria and other microorganisms.
• Bleaching Agent:
  As the name suggests, it is used as a bleaching agent in the textile and paper industries to bleach fabrics and paper pulp.

• Oxidizing Agent:
  It is used in chemical industries for oxidation reactions.
• In the Manufacture of Chlorine:
  Bleaching powder is also used in the production of chlorine gas.

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