Assertion (A):- ${\mathrm{MgSO}}_4$ is readily soluble in water

Reason (R):- The greater hydration enthalpy of ${\mathrm{Mg}}^{2+}$ ions overcome its lattice enthalpy.

Identify $\mathrm{X}$ and $\mathrm{Y},$respectively in the following reactions

Given below are two statements:

Statement I : Both ${\mathrm{CaCl}}_2.6{\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{MgCl}}_2.8{\mathrm{H}}_2\mathrm{O}$ undergo dehydration on heating.

Statement II : $\mathrm{BeO}$ is amphoteric, whereas the oxides of other elements in the same group are acidic.

In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements:

Statement I : None of the alkaline earth metal hydroxides dissolve in alkali.

Srtatement II : Solubility of alkaline earth metal hydroxides in water increases down the group.

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

Match List$- \mathrm{I}$ with List $- \mathrm{II}$ :

Choose the most appropriate answer from the options given below

Number of amphoteric compounds among the following is

(A) $\mathrm{BeO}$

(B) $\mathrm{BaO}$

(C) $\mathrm{Be}{\left(\mathrm{OH}\right)}_2$

(D) $Sr{\left(\mathrm{OH}\right)}_2$

An orange solid $\mathrm{A}$ on heating gives a green residue $\mathrm{B},$ a colourless gas $\mathrm{C}$ and water vapours. The dry gas $\mathrm{C}$ upon pasing over heated $\mathrm{Mg}$ gave a white solid $\mathrm{D}$ which upon subsequent reaction with water gave a gas $\mathrm{E}$ that gave dense white fumes with $\mathrm{HCl}$.

Identify $\mathrm{D}$