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Q.

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 trend of ionic size in aqueous solution  is  A+ > B+ > C+ > D+ > E+. The element ‘B’ in the sequence is

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a

K

b

Na

c

Cs

d

Rb

answer is B.

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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;F) Hardness, Metallic bond strength….Li>Na>K>Rb>Cs;G) Metallic character….LiK>Rb>Li>Cs;J) Hydration Enthalpy….Li+>Na+>K+>Rb+>Cs+Thus ionic size in aqueous solution…..Li+>Na+>K+>Rb+>Cs+Thus ionic mobility in aqueous solution…..Li+Na+>K+>Rb+>Cs+K) EM+/M° values are negative.Most negative for Li and least negative for Na.ELi+/Li°most negative
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