First slide

Trends in Atomic Properties & Physical Properties

Question

Which of the following is not a proper trend

Moderate

A

Na > K > Rb > Li > Cs ……Abundance in earth’s crust
B

Li > Na > K > Rb > Cs ……Reducing power in aqueous solution
C

Li > Na > K > Rb > Cs ……Ionization potential
D

Li > Na > K = Rb > Cs ……Electronegativity on Pauling scale

Solution

Lithium is the best reducing agent in aqueous solution due to very high hydration enthalpy of ${Li}^{+}$
Expected trend : Li < Na < K < Rb < Cs
Actual trend : Na < K < Rb < Cs < Li
Evidence;
SRP values: $E_{{Na}^{+} / Na}^{o} > E_{K^{+} / K}^{o} > E_{{Rb}^{+} / Rb}^{o} > E_{{Cs}^{+} / Cs}^{o} > E_{{Li}^{+} / Li}^{o}$

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