Q. What is the trend in thermal stability of Group 2 nitrates?
Thermal stability increases down the group. The charge density of the ion decreases. The ability of the Group 2 ion to polarise a nitrate ion decreases.
Q. What is the trend in thermal stability of Group 2 carbonates?
Thermal stability increases down the group. The charge density of the ion decreases. The ability of the Group 2 ion to polarise a carbonate ion decreases.
Q. Explain the trend in the solubility of Group 2 hydroxides.
The solubility of Group 2 hydroxides increases down the group. Lattice dissociation enthalpy and enthalpy change of hydration both decrease down the group, but lattice dissociation enthalpy decreases more. The enthalpy change of the solution is more exothermic further down the group.
Q. Explain the trend in the solubility of Group 2 sulfates?
The solubility of Group 2 sulfates decreases. Lattice dissociation enthalpy and the enthalpy change of hydration both decrease, but hydration enthalpy decreases more. The enthalpy change of the solution becomes more endothermic.
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