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

It is also known as Graham's salt.

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Calgon contains the

2^{n d}

most abundant element by weight in the Earth's crust.

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It does not remove

C a^{2 +}

ion by precipitaion.

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It is polymeric compound and is water soluble.

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Solution

The correct option is B Calgon contains the $2^{n d}$
most abundant element by weight in the Earth's crust.
$2^{n d}$ most abundant element is $S i$ and it is not present in calgon $N a_{6} P_{6} O_{18}$ ( Graham's salt or Sodium hexametaphosphate)

It exist in polymeric form as $(N a P O_{3})_{6}$ and water soluble compound
It removes $C a^{2 +}$ in soluble ion but not by precipitation

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