Easy MCQ +4 / -1 PYQ · JEE Mains 2021

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

  1. A It is also known as Graham's salt.
  2. B It is polymeric compound and is water soluble.
  3. C It does not remove Ca<sup>2+</sup> ion by precipitation.
  4. D Calgon contains the 2<sup>nd</sup> most abundant element by weight in the Earth's crust. Correct answer

Solution

Calgon is sodium hexametaphosphate, a polymeric compound also called as Graham’s salt.<br><br> Order of abundance of element in earth crust is<br><br> O &gt; Si &gt; Al &gt; Fe &gt; Ca &gt; Na &gt; Mg &gt; K<br><br> So second most abundant element in earth crust is Si not Ca.

About this question

Subject: Chemistry · Chapter: p-Block Elements · Topic: Group 13: Boron Family

This question is part of PrepWiser's free JEE Main question bank. 300 more solved questions on p-Block Elements are available — start with the harder ones if your accuracy is >70%.

More p-Block Elements questions

Drill 25 more like these. Every day. Free.

PrepWiser turns these solved questions into a daily practice loop. Chapter-wise drills, full mocks, AI doubt chat. No auto-renew.

Start free →