Starting with CaCO₃, write balanced chemical equation showing the preparation of:
(i) CaO        (ii) CaSO₄        (iii) Ca(OH)₂       (iv) Ca(HCO₃)₂ solution.

Describe two important uses of the following;
(a) Caustic soda (b) Sodium carbonate   (iii) Quick lime.

What happens when,
(i) magnesium is burnt in air
(ii) quick- lime is heated with silica
(iii) chlorine reacts with slaked lime
(iv) calcium nitrate is heated?

Discuss the composition and manufacturing details of cement.
Or
Mention the main constituents of Portland cement.

195.

Complete the following equations:

Contrast the action of heat on the following and explain your answer:
(i) Na₂CO₃ and CaCO₃
(ii) MgCl₂.6H₂O and CaCl₂.6H₂O
(iii) Ca(NO₃)₂ and NaNO₃.

Explain the significance of magnesium and calcium in biological fluids. 

What are the common physical and chemical features of alkali metals?

Discuss the general characteristics and gradation in properties of alkaline earth metals.

Compare the alkali metals and alkaline earth metals with respect to (i) ionisation enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.