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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 correct trend of reducing power for these elements in aqueous solution is  A > B > C > D > E. The element ‘A’ in the sequence is

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a

Li

b

Na

c

Cs

d

Rb

answer is A.

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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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