For alkali metals, which one of the following trends is incorrect ?

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Hydration energy, ${Li}^{+} > {Na}^{+} > K^{+} > {Rb}^{+}$

Ionisation energy, $L i > N a > K > R b$

Density, $L i < N a < K < R b$

Atomic size, $L i < N a < K < R b$

answer is C.

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Detailed Solution

In general, on moving downward in group, density increases but density of potassium (K) is lesser than that of the sodium (Na). This is because of the abnormal increase in atomic size on moving from Na (186pm) to K (227pm).

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