Answer:
(i) Carbonates of alkaline earth
metals decompose on heating into corresponding oxide and\[C{{O}_{2}}\]. The
thermal stability increases from top to bottom in the group. Increasing stability
can be explained on the basis of decreasing polarising power and covalent
character. The stability increases as the size of the cation increases
gradually which can easily stabilise the bigger \[CO_{3}^{2-}\]ion.
(ii) All the members of group 2
form oxides of the type MO. Barium and radium form peroxides also. Except\[~BeO\],
which is amphoteric, other MO oxides are basic in nature as they combine with
water to form basic hydroxides.
\[MO+{{H}_{2}}O\to
M{{(OH)}_{2}}\]
Basic nature of the oxides
increases gradually from \[BeO\]to\[BaO\].
\[BeO\]and\[MgO\] are insoluble
in water on account of high lattice energies while the solubility of other
oxides increases gradually.
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