JEE PYQ: Hydrogen Question 8
Question 8 - 2021 (26 Feb Shift 2)
Calgon is used for water treatment. Which of the following statement 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 polymeric compound and is water soluble. (d) It does not remove Cat ion by precipitation.
Show Answer
Answer: (a)
Solution
Calgon is $\text{Na}_6(\text{PO}_3)_6$. Order of abundance in earth crust: O > Si > Al > Fe > Ca > Na > Mg > K. The second most abundant element is Si, not Ca. Hence statement (a) is not true.
BETA
