Home Chemistry Hydrogen and Its Compounds ( Not in Syllabus ) JEE Main 2021 Calgonis used for water treatment. Which of …
Chemistry Hydrogen and Its Compounds ( Not in Syllabus ) JEE Main 2021 Single Correct MCQ
Published on: August 13, 2026

Calgonis used for water treatment. Which of the following statement 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 polymeric compound and is water soluble.
D
It doesnot remove Cat ion by precipitation.

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The correct answer is:
A

JEE Main 2021

or

Order of abundance of element in earth crust is

O > Si > Al > Fe > Ca > Na > Mg > K

So second most abundant element in earth crust is Si not Ca.

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