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Ionic Radii and Ionisation Enthalpy (Group 2)

Thermal stabi...

Question

Thermal stability of $B a C O_{3}, C a C O_{3}$ and $M g C O_{3}$ is:

A

B a C O_{3} > C a C O_{3} > M g C O_{3}

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B

B a C O_{3} > M g C O_{3} > C a C O_{3}

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C

C a C O_{3} > M g C O_{3} > B a C O_{3}

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D

M g C O_{3} > C a C O_{3} > B a C O_{3}

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Solution

The correct option is C $B a C O_{3} > C a C O_{3} > M g C O_{3}$
(i) More be the ionic nature, more be the attractive force between the species.
(ii) More be the attractive force, more be the thermal stability.
(iii) Ionic character for the same anionic species, increases down the group.
Thus, correct order of the thermal-stability is $B a C O_{3} > C a C O_{3} > M g C O_{3}$ .

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