Which of the following is/are correct order of thermal stability?

L i_{2} C O_{3} < N a_{2} C O_{3} < K_{2} C O_{3} < C s_{2} C O_{3}

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B e (N O_{3})_{2} > M g (N O_{3})_{2} > C a (N O_{3})_{2} > B a (N O_{3})_{2}

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B e_{3} N_{2} > M g_{3} N_{2} > C a_{3} N_{2} > S r_{3} N_{2} > B a_{3} N_{2}

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L i_{2} O < N a_{2} O < K_{2} O < R b_{2} O < C s_{2} O

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Solution

The correct options are
A $L i_{2} C O_{3} < N a_{2} C O_{3} < K_{2} C O_{3} < C s_{2} C O_{3}$
C $B e_{3} N_{2} > M g_{3} N_{2} > C a_{3} N_{2} > S r_{3} N_{2} > B a_{3} N_{2}$
Thermal stability of a compound is determined by the temperature needed to decompose the compound.
The thermal stability of nitrates and carbonates increases from top to bottom in a group and oppositely thermal stability of oxide and nitrides decreases from top to bottom.

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