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

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

It does not remove ${Ca}^{2 +}$ ion by precipitation.

It is also known as Graham’s salt

It is polymeric compound and is water soluble.

answer is A.

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Detailed Solution

${Na}_{2} [{Na}_{4} P_{6} O_{18}] \to 2 {Na}^{+} + {[{Na}_{4} P_{6} O_{18}]}^{- 2}$ . The sodium ions are replaced by calcium ions or magnesium ions and hence the hardness is decreased.

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