Which of the following order is correct of the given property?

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$\begin{aligned} {BeF}_{2} < {MgF}_{2} < {CaF}_{2} < {SrF}_{2} < {BaF}_{2} \end{aligned}$ (Solubility order)

$BaO > SrO > CaO > BeO > MgO$ (Basic Character order)

$LiCl > NaCl > KCl > RbCl > CsCl$ (Thermal stability order)

${NO}_{2} > N_{2} O_{5} > NO > N_{2} O$ (Acidic order)

answer is A.

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Detailed Solution

Thermal stability for ionic compounds having monoatomic anions $\propto$ lattice energy.

So, the correct order of increased thermal stability is: $LiCl > NaCl > KCl > RbCl > CsCl$ (Thermal stability order).

Hence, option A is correct.

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