Q.

Which of the group 13 element have highest ionization enthalpy?

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a

Al

b

B

c

Tl

d

In

answer is C.

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Detailed Solution

Boron is the first and smallest element of group-13 elements. Ionization enthalpy decreases on moving down the group but sometimes this trend also has certain exception. 

For group-13 elements, ionization enthalpy trend is:

B>Tl>Ga>Al>In

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