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Question

What is the correct order of ionisation energy?

A
B > Al < Ga > In < Tl
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B
B < Al > Ga > In > Tl
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C
B > Al > Ga > In >Tl
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D
B > Al < Ga < In < Tl
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Solution

The correct option is C B > Al > Ga > In >Tl
In the group of Boron, as we move down ionic radii increase thereby decreasing ionisation potential/energy, as larger the radii more loosely held is the outermost e.

B>Al>Ga>In>Tl

Hence, the correct option is C

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