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

a. Calgon contains the 2nd most abundant element by weight in the earth's crust
b. It is also known as Graham's salt.
c. It is a polymeric compound and is water-soluble.
d. It does not remove Ca2+ ion by precipitation.
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The correct answer is opion  A)

Calgon contains the 2nd most abundant element by weight in the earth's crust

EXplaination ::


Order of abundance of element in earth crust is
O > Si > Al > Fe > Ca > Na > Mg > K
So, the second most abundant element in the earth’s crust is Si not Ca. 

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