Select the correct order for the given properties :

Thermal stability order :

N a N O_{3} < K N O_{3} < R b N O_{3}

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Solubility in water :

N a N O_{3} > K N O_{3} > R b N O_{3}

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Melting point order :

N a F > K F > R b F

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Covalent character order :

N a F > K F > R b F

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Solution

The correct options are
A Solubility in water : $N a N O_{3} > K N O_{3} > R b N O_{3}$
B Thermal stability order : $N a N O_{3} < K N O_{3} < R b N O_{3}$
C Covalent character order : $N a F > K F > R b F$
D Melting point order : $N a F > K F > R b F$
Thermal stability increases in the order : $N a N O_{3} < K N O_{3} < R b N O_{3}$ . This is the same order in which lattice enthalpy increases.
Solubility in water decreases in the order. $N a N O_{3} > K N O_{3} > R b N O_{3}$ . This is due to increase in the lattice energy and decrease in the hydration energy.
Melting point decreases in the order $N a F > K F > R b F$ .
Covalent character decreases in the order $N a F > K F > R b F$ . With increase in the size of the cation, the polarization power decreases and the covalent character decreases.

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