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Q. The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order.
$ K_2CO_3 (I), MgCO_3 (II) , CaCO_3 (III) , BeCO_3 (IV) $

AIEEEAIEEE 1996The s-Block Elements

Solution:

Thermal stability of salts with common anion depends on polarising power of cation. Greater the polarising power, lower be their thermal stability. Hence,
$ BeCO_3 (IV) < MgCO_3 (II) < CaCO_3 (III) < K_2CO_3 (I) $