Which of the following statement(s) is/are correct? (i) Li NO NO ₃, Ba ( NO ₃ )₂ both will give NO ₂ on heatiing (ii) BaSO ₄ is less soluble in water than CaSO ₄ (iii) Alkaline earth metals do not dissolve in liquid ammonia

Step-by-step solution

4 Li NO ₃ 2 Li ₂ O +4 NO ₂+ O ₂ (anomalous behaviour) 2 Ba ( NO ₃ )₂ 2 BaO +4 NO ₂+ O ₂ Thus, (i) is correct. The solubility of alkaline earth metals decreases down the group due to a decrease in hydration enthalpy compared to the lattice enthalpy. Thus, BaSO ₄ will be less soluble in water than CaSO ₄ . Thus, (ii) is also correct. Alkaline earth metals dissolve in liquid ammonia to form a coloured solution. M +( x + y ) NH ₃ [ M ( NH ₃ )_ x ]²⁺+2 [ e ( NH ₃ )_ y ]⁻ Thus, (iii) is incorrect.