Given below are two statements, one is labelled as

Assertion A and the other is labelled as Reason R.

Assertion A : Beryllium has less negative value of reduction potential compared to the other alkaline earth metals

Reason R : Beryllium has large hydration energy due to small size of ${\mathrm{Be}}^{2+}$but relatively large value of atomisation enthalpy.

In the light of the above statements, choose the most appropriate answer from the options given below.

Identify the correct statements about alkali metals.

A. The order of standard reduction potential $({\mathrm{M}}^{+} | \mathrm{M})$ for alkali metal ions is $\mathrm{Na} > \mathrm{Rb} > \mathrm{Li}$.

B. $\mathrm{CsI}$ is highly soluble in water.

C. Lithium carbonate is highly stable to heat.

D. Potassium dissolved in concentrated liquid ammonia is blue and paramagnetic.

E. All alkali metal hydrides are ionic solids.

Choose the correct answer from the options given below

Match List I with List II

Choose the correct answer from the options given below:

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A:- The alkali metals and their salts impart characteristic colour to reducing flame.

Reason R:- Alkali metals can be detected using flame tests.

In the light of the above statements, choose the most appropriate answer form the options given below

The correct order of hydration enthalpies is

(A) ${\mathrm{K}}^{+}$
(B) ${\mathrm{Rb}}^{+}$
(C) ${\mathrm{Mg}}^{2+}$
(D) ${\mathrm{Cs}}^{+}$
(E) ${\mathrm{Ca}}^{2+}$

Choose the correct answer from the options given below:

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: