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Question

The stone like deposit formed at the bottom of a boiler, when hard water is boiled into it, is called:
  1. scaling
  2. rusting
  3. galvanising
  4. lathering


Solution

The correct option is A scaling
When hard water is boiled in a boiler the calcium bicarbonate decomposes to form an insoluble calcium carbonate. This insoluble calcium carbonate deposits at the bottom of a boiler. This stone like deposition is known as scaling. It is a bad conductor of heat.

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