Question

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

a. Calgon contains the 2^nd 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.

Answer 1

The correct answer is opion  A)

Calgon contains the 2^nd 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.