This question is about some Group 2 compounds.
(a) Explain the trend in the thermal stability of carbonates in Group 2.
(3)
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(b) Magnesium chloride is soluble in water. The enthalpy level diagram for the
dissolving of magnesium chloride is
Mg2+(g) + 2Cl–(g)
– 2493 kJ mol–1
enthalpy
MgCl (s)