Lithium aluminium hydride can be prepared from the reaction of :

The alkaline earth metal sulphate(s) which are readily soluble in water is/are :

A. $$\mathrm{BeSO}_{4}$$

B. $$\mathrm{MgSO}_{4}$$

C. $$\mathrm{CaSO}_{4}$$

D. $$\mathrm{SrSO}_{4}$$

E. $$\mathrm{BaSO}_{4}$$

Choose the correct answer from the options given below :

The correct order of hydration enthalpies is

(A) K$$^+$$

(B) Rb$$^+$$

(C) Mg$$^{2+}$$

(D) Cs$$^+$$

(E) Ca$$^{2+}$$

Choose the correct answer from the options given below :