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The S-Block Elements

Question
CBSEENCH11006986
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Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

Solution

It is due to high hydration energy of small lithium ion which more than compensates high ionisation enthalpy. The hydration energy of Li+ ion is very high and as a result of this reduction potential of lithium is very low(E°= –3). So lithium acts as the most powerful reducing agent in aqueous solution.

Some More Questions From The s-Block Elements Chapter

In aqueous solution, Li+ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason. 

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

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