Q6 of 21 Page 18

State some units of hardness.

Hardness can be measured in parts per million, Degree Clarke and Degree French.


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Out of water obtained from rain, pond, tap and hand pump, which one is best suited for cleaning purposes?

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State the reason for deposition of white scale in the interior of boilers after prolong use?

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Which type of water is associated with heart diseases?

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On what factor does the production of foam depend?