BeO is insoluble but BaO is soluble as

Consider the following statements. I. BeO is insoluble but BeSO_(4) is soluble in water. II. BaO is insoluble but BaSO_(4) is soluble in water. III. Lii is more soluble than Kl in ethano. The true statements are

Explain the following: (a) KO_2 is paramagnetic. (b) Lithium forms oxide, sodium forms peroxide while potassium and rubidium form superoxides. (c) BaO is soluble but BaSO_4 is insoluble in water.

Na_(2)SO_(4) is water soluble but BaSO_(4) is insoluble because :

Cu^(+) and Na^(+) are of same size but CuCl is insoluble while NaCl is soluble in water. Explain.

How would you explain the following observations ? (i) BeO is almost insoluble but BeSO_(4) is soluble in water (ii) BaO is soluble but BaSO_(4) is insoluble in water (iii) LiI is more soluble than KI in ethanol

Two metals (A) and (B) belong to the same group of the periodic table. Metal (A) forms and insoluble oxide but a soluble sulphate, metal (B) forms a soluble oxide but an insoluble oxide but an insoluble sulphate. Both metals (A) and (B) form hydroxides which are soluble in alkalis. (A) and (B) are