JEE Main Chemistry question

Not in JEE Main or NEET syllabus

For alkali metals, which one of the following trends is incorrect? [K CET 2010]

(A)Hydration energy :
(B)Ionisation energy :
(C)Density : Correct
(D)Atomic size :

Answer: (C)

Solution

Density does not increase smoothly down Group 1 — potassium is anomalously less dense than sodium due to a disproportionately large jump in atomic size from Na to K, giving the true order , not as stated in option (C). Hydration energy

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Question ID VK-133166