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Q.

The density of alkali metals is in the order

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a

Na<Rb<K<Cs

b

K<Cs<Na<Rb

c

Na<K<Cs<Rb

d

K<Na<Rb<Cs

answer is B.

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Detailed Solution

Due to their large size,
The atoms of alkali metals
Are less closely packed on going down the group, both the atomic size & atomic mass increase

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