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Calgon is used for water treatment. Which of the following statement is not true about Calgon ?

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it is polymeric compound and is water soluble.

it is also known as Graham’s salt.

Calgon contains the 2^nd most abundant element by weight in the Earth’s crust

It does not remove Ca²⁺ ion by precipitation

answer is B.

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Detailed Solution

Calgon is sodium hexametaphosphate, a polymeric compound also called as Graham’s salt.

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