A) Hydration energy: \[Li>Na>K>Rb\]
B) Ionization energy: \[Li>Na>K>Rb\]
C) Density: \[Li<Na<K<Rb\]
D) Atomic size: \[Li<Na<K<Rb\]
Correct Answer: B
Solution :
In general, density increases on moving downward in a group 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 \[Na(86pm)\] to \[K(227pm)\]. Thus, the correct order of density is \[Li<K<Na<Rb\]
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