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Q.

Which among the following is thermally least stable?

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a

${CB}_{2} {CO}_{3}$

b

$K_{2} {CO}_{3}$

c

${Li}_{2} {CO}_{3}$

d

${Na}_{2} {CO}_{3}$

answer is A.

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Detailed Solution

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Lithium carbonate is thermally the least stable

Moving down a group enhances a carbonate's thermal stability. Lithium carbonate, ${Li}_{2} {CO}_{3}$ , is therefore the least thermally stable.

${Li}_{2} {CO}_{3} \overset{Δ}{⟶} {Li}_{2} O + {CO}_{2} ↑$

Hence, option A is correct.

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Which among the following is thermally least stable?