The reaction of calcium cyanamide with water yields

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.

Reaction of ${\mathrm{BeCl}}_2$ with ${\mathrm{LiAlH}}_4$ gives :

(A) ${\mathrm{AlCl}}_3$

(B) ${\mathrm{BeH}}_2$

(C) $\mathrm{LiH}$

(D) $\mathrm{LiCl}$

(E) ${\mathrm{BeAlH}}_4$

Choose the correct answer from options given below

Given below are two statements :

Statement I : Lithium and Magnesium do not form superoxide

Statement II : The ionic radius of ${\mathrm{Li}}^{+}$ is larger than ionic radius of ${\mathrm{Mg}}^{2+}$ In the light of the above statements, choose the most appropriate answer from the questions given below :

In the light of the above statements, choose the most appropriate answer from the questions given below :

Among the statement (I – IV), the correct ones are:

(I) Be has smaller atomic radius compared to Mg.

(II) Be has higher ionization enthalpy than AI.

(III) Charge/radius ratio of Be is greater than that of Al.

(IV) Both Be and Al form mainly covalent compounds