$NaF$ is predominantly ionic and if the cationic part of the compound is replaced by potassium ion. Then how many of given properties decreases in the formed compound.
(P) Melting point
(Q) Lattice energy
(R) Solubility in water
(S) Thermal stability
(T) Covalent character

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answer is 4.

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Detailed Solution

When, the cationic part of $NaF$ compound is replaced by potassium ion, then melting point, lattice energy, thermal stability, and covalent character decreases in the resultant compound.

Thus, 4 properties decrease in the resultant compound.

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