Calgon is used for water treatment. Which of | vedclass

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(A) Calgon is sodium hexametaphosphate,with the formula $(NaPO_{3})_{6}$ or $Na_{6}P_{6}O_{18}$.$1$. The $2^{nd}$ most abundant element in the Earth's

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Calgon contains the $2^{nd}$ most abundant element by weight in the Earth's crust.

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(A) Calgon is sodium hexametaphosphate,with the formula $(NaPO_{3})_{6}$ or $Na_{6}P_{6}O_{18}$.$1$. The $2^{nd}$ most abundant element in the Earth's crust by weight is Silicon $(Si)$,which is not present in Calgon. Thus,statement $A$ is false.$2$. Calgon is a polymeric compound and is water-soluble. Statement $B$ is true.$3$. It is commonly known as Graham's salt. Statement $C$ is true.$4$. It removes $Ca^{2+}$ and $Mg^{2+}$ ions by forming soluble complex ions,not by precipitation. Statement $D$ is true.Therefore,the statement that is $NOT$ true is $A$.

Calgon is used for water treatment. Which of the following statements is $NOT$ true about Calgon?

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