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JEE · NEET Previous Year Question

$The correct order of the first ionization enthalpy is$

Topic: JEE PYQ

Answer: C. Full step-by-step solution below.

A $Al > Ga > Tl$
B $Ga > Al > B$
C $Tl > Ga > Al$
D $B > Al > Ga$

Correct answer: C

Solution

(c) (i) due to lanthanide contraction T l has more I.E. as compared to Ga and A l mathongo ◻ (ii) due to scandide contraction Ga has more I.E. as compared to A l

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