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JEE Main levelSingle correct optionDifficulty 2 of 3sb133

Which is the correct increasing order of thermal stability of the Group 2 carbonates?

A $BaCO X_{3} < SrCO X_{3} < CaCO X_{3} < MgCO X_{3} < BeCO X_{3}$
B $MgCO X_{3} < BeCO X_{3} < CaCO X_{3} < BaCO X_{3} < SrCO X_{3}$
C $CaCO X_{3} < MgCO X_{3} < BeCO X_{3} < SrCO X_{3} < BaCO X_{3}$
D $BeCO X_{3} < MgCO X_{3} < CaCO X_{3} < SrCO X_{3} < BaCO X_{3}$

Answer: D

The small, highly polarising cation distorts the carbonate ion and decomposes it to the oxide more easily. Polarising power falls down the group, so the decomposition temperature rises from

BeCO X_{3}

to

BaCO X_{3}

.

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