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Question

Water does not contain mineral salts of:

A
sodium
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B
gold
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C
calcium
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D
magnesium
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Solution

The correct option is A gold
The principal ions found in water are calcium, magnesium, sodium, bicarbonate, sulfate, chloride and nitrate. A few parts per million of iron or manganese may sometimes be present and there may be traces of potassium salts, whose behaviour is very similar to that of sodium salts.

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