Q4 of 21 Page 18

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

Rain water is best suited for cleaning purposes as it is distilled water and does not contain calcium and magnesium ions.


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2

What causes permanent hardness of water?

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How can temporary hardness of water be removed?

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

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State some units of hardness.