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The following compounds have been arranged in order of their increasing thermal stabilities, identify the correct order

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(I) BaCO3

(II) MgCO3

(III) CaCO3

(IV) BeCO3

(A) I < II < III < IV
(B) IV < II < III < I
(C) IV < II < I < III
(D) II < IV < III < I

Ans. B

Sol. Salt is combination of one acidic oxide (CO¬2) and one basic oxide(M2O), basic strength of basic oxide increase down the group, So thermal stability also increase down the group.

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