A, B, C, D and E(Francium is not included in the list) are the elements belonging to First group of Modern periodic table. The Melting point trend of these elements is A > B > C > D > E. The element ‘E’ in the sequence is
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a
Li
b
Rb
c
Na
d
Cs
answer is D.
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Detailed Solution
A) Atomic radius…LiNa>K>Rb>Cs;C) EN…..Li>Na>K=Rb>Cs;D) MP…Li>Na>K>Rb>Cs;E) BP…Li>Na>K>Rb>Cs;