Select the incorrect statement.

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(C) $1$. The solubility of carbonates of alkali metals increases down the group because the lattice energy decreases more rapidly than the hydration e

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Thermal stability of nitrates of group-$1$ cations decreases down the group.

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(C) $1$. The solubility of carbonates of alkali metals increases down the group because the lattice energy decreases more rapidly than the hydration energy as the size of the cation increases.$2$. The melting point of alkali metal fluorides decreases down the group $(NaF > KF > RbF > CsF)$ due to the decrease in lattice energy as the size of the cation increases.$3$. The thermal stability of nitrates of group-$1$ metals increases down the group because the electropositive character of the metal increases,making the $M-O$ bond stronger.$4$. The solubility of bicarbonates of alkali metals increases down the group due to the decrease in lattice energy,following the order $LiHCO_3 > NaHCO_3 > KHCO_3 > RbHCO_3 > CsHCO_3$. Thus,the statement $Na^{+} < K^{+} < Rb^{+} < Cs^{+}$ is incorrect.

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