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Calgon is used for water treatment. Which of the following statement is NOT true about Calgon? (1) Calgon contains the 2 most abundant element by weight in the Earth's crust. (2) It is polymeric compound and is water soluble. (3) It is also known as Graham's salt. (4) It does not remove Ca2+ ion by precipitation.

1. Calgon contains the 2 most abundant element by weight in the Earth's crust.
2. It is polymeric compound and is water soluble.
3. It is also known as Graham's salt.
4. It does not remove Ca2+ ion by precipitation.

Correct answer: Calgon contains the 2 most abundant element by weight in the Earth's crust.

Solution

The correct option is accurate because Calgon, which is a brand name for sodium hexametaphosphate, does not primarily consist of the two most abundant elements in the Earth's crust, which are oxygen and silicon. Instead, it is a compound that serves a specific function in water treatment.

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