Question

Alkali and alkaline earth metals along with hydrogen and helium constitute s-block elements . They have low ionization enthalpies and hence exhibit characteristic flame colouration . They have highly negative electrode potentials and hence are strong reducing agents . Their solutions in liquid ammonia are conducting and also act as strong reducing agents than hydrogen , they are usually prepared by electrolysis of their fused chlorides . Their oxides are basic and the basic strength increases down the group . The solubility of carbonates and sulphates of alkali and alkaline earth metals show opposite trends . The carbonates of alkaline earth metals and lithium carbonate decompose on heating while the carbonates of other alkali metals do not decompose on heating . The bicarbonates of both alkali and alkaline earth metals on heating give carbonates .
Which of the following are arranged in increasing order of solubilities ?
A. `CaCO_(3) lt KHCO_(3) lt NaHCO_(3)`
B. `NaHCO_(3) lt KHCO_(3) lt CaCO_(3)`
C. `KHCO_(3) lt NaHCO_(3) lt CaCO_(3)`
D. `CaCO_(3) lt NaHCO_(3) lt KHCO_(3)`.

Answer 1

Correct Answer - D
The solubility of bicarbonates of alkali metals increases down the group . But alkaline earth metal carbonates are insoluble in `H_(2)O` , i.e., option (d) is correct .