Which of the carbonates given below is unstable in air and is kept in CO₂ atmosphere to avoid decomposition.

(i) BeCO₃

(ii) MgCO₃

(iii) CaCO₃

(iv) BaCO₃

Li⁺ has the highest hydration enthalpy.

Hence it is most hydrated

Therefore, Correct order of hydrated radii is Cs⁺ < Rb⁺ < K⁺ < Na⁺ < Li⁺

Sodium carbonate is a white crystalline solid which exists as a decahydrate,  This is also called washing soda.

Suspension of slaked lime in water is known as milk of lime

Crude sodium chloride obtained by crystallisation of brine solution contains CaSO₄, Na₂SO₄ and MgCl₂

Beryllium salts are easily hydrolysed

Gypsum : CaSO₄ * 2H₂O