s-Block ElementsHard

Question

Select correct statement(s) :

Options

A.CaCO3 is more soluble in a solution of CO2 than in H2O.
B.Na2CO3 is converted to Na2O and CO2 on heating.
C.Li2CO3 is thermally unstable.
D.Presence of CaCl2 or CaSO4 in water causes temporary hardness.

Solution

(A) CaCO3 + H2O + CO2 →  Ca(HCO3)2 soluble.
(B) Sodium is more basic (i.e. more ionic) in nature ; so Na2CO3 is thermally stable towards heat. It does not decompose to give Na2O and CO2  
(C) Li is least basic (i.e. more covalent) in nature ; so Li2CO3 is thermally unstable.
(D) Presence of CaCl2 or CaSO4 in water causes permanent hardness. Temporary hardness of water is due to the presence of bicarbonates of Ca2+ and Mg2+.

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