Question:
Calgon is used for water treatment. Which of the following statement is NOT true about calgon?
Correct Option: 1
Solution:
$\mathrm{Na}_{6}\left(\mathrm{PO}_{3}\right)_{6}$ or $\mathrm{Na}_{6} \mathrm{P}_{6} \mathrm{O}_{18}$
Order of abundance of element in earth crust is
$\mathrm{O}>\mathrm{Si}>\mathrm{Al}>\mathrm{Fe}>\mathrm{Ca}>\mathrm{Na}>\mathrm{Mg}>\mathrm{K}$
So second most abundant element in earth crust is Si not Ca.
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