A) \[Cs>Rb>K>Na\]
B) \[Cs>Rb>Na>K\]
C) \[Rb>Cs>K>Na\]
D) \[Rb>Cs>Na>K\]
Correct Answer: B
Solution :
On moving downward in a group, the density increases due to increase in atomic mass. But on moving from Na to K, the atomic size increases suddenly, therefore the density of Na is greater than K. Hence, the correct order of density is as \[Cs>Rb>Na>K\]
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