Which of the carbonates given below is unstable in air and is kept in $C O_{2}$ atomosphere to avoid decomposition?
(a) $B e C O_{3}$ (b) $M g C O_{3}$ (c) $C a C O_{3}$ (d) $B a C O_{3}$

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Solution

(a)

$B e C O_{3}$ is unstable to the extent that it is stable only in atomosphere of $C O_{2} . B e C O_{3}$ shows reversible reaction because stability o foxide formed is more than carbonates.
$B e C O_{3} ⇌ B e O + C O_{2}$
$B e C O_{3}$ is unstable due to strong polarising effect of small $B e^{2 +}$ ion on the large polarisable carbonation . Moreover, an extrastability f the oxide achieved through lattice energy by opacking small cation with small oxide. Ion.

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