The standard enthalpy of formation for alkali metal bromides becomes less negative on descending the group.

The low solubility of CsI in water is due to its high lattice enthalpy.

Among the alkali metal halides, LiF is least soluble in water.

LiF has least negative standard enthalpy of formation among alkali metal fluorides.

2, 0 and 1

0.5, 0 and 2

5, 0 and 0.5

2, 0 and 0.5

Ca(HCO₃)₂, CaCO₃

CaCO₃, Ca(HCO₃)₂

CaO, Ca(HCO₃)₂

CaO, CaCO₃

(a) - (v), (b) - (i), (c) - (ii), (d) - (iv)

(a) - (v), (b) - (ii), (c) - (iv), (d) - (i)

(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)

(a) - (v), (b) - (iii), (c) - (ii), (d) - (i)