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 ?

Alkali and alkaline earth metals along with hydrogen and helium consti

1.	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 ?
Answer» `CaCO_(3) lt KHCO_(3) lt NaHCO_(3)` `NaHCO_(3) lt KHCO_(3) lt CaCO_(3)` `KHCO_(3) lt NaHCO_(3) lt CaCO_(3)` `CaCO_(3) lt NaHCO_(3) lt KHCO_(3)`. Solution :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 .