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The scales formed due to hard water containing  CaSO_4 are:

 

Option: 1

Easy to remove

 


Option: 2

Difficult to remove


Option: 3

Soluble in water


Option: 4

Formed due to soap hydrolysis


Answers (1)

best_answer

In a boiler, water is continuously converted into steam which in turn increases the salt concentration.
A stage is reached when these change into a loose and slimy precipitate called sludge and if there are hard adhering coatings called scales.

Thus, scales are hard deposits, which stick very firmly to the inner surface of the boiler.

Posted by

vinayak

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