Calgon contains the 2nd most abundant element by weight in the Earth's crust.
B
It is polymeric compound and is water soluble.
C
It is also known as Graham's salt
D
It does not remove Ca2+ ion by precipitation
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Solution
2nd most abundant element is "Si" and it is not present in calgon
$\mathrm{Na}_6 \mathrm{P}_6 \mathrm{O}_{18}=$ (Graham's salt) (Sodium hexametaphosphate)
It exist in polymeric form as $\left(\mathrm{NaPO}_3\right)_6$ and water soluble compound
It removes $\mathrm{Ca}^{2+}$ in soluble ion but not by precipitation
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