Calgon is used for water treatment. Which of the following...

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

Options

AIt is polymeric compound and is water soluble.
BCalgon contains the ${2}^{nd}$ most abundant element by weight in the Earth's crust.
CIt is also known as Graham's salt.
DIt doesnot remove ${Ca}^{2 +}$ ion by precipitation.

Correct answer

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

Step-by-step solution

$\to {2}^{nd}$ most abundant element is $Si$ and it is not present in calgon ${Na}_{6}{P}_{6}{O}_{18} =$ (Graham's salt)(Sodium hexametaphosphate)

$\to$ It exist in polymeric form as ${\left({\text{ NaPO }}_{3}\right)}$ _{6} $and water soluble compound</p><p>$ \to $It removes$ {Ca}^{2 +} in soluble ion but not by precipitation

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