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A, B, C and D are the elements belonging to 17th group of Modern periodic table. The correct trend of Ionization enthalpy of their ions is A- > B- > C- > D-. The element ‘D’ in the sequence is

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By Expert Faculty of Sri Chaitanya
a
F
b
Br
c
I
d
Cl
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detailed solution

Correct option is C

Atomic radius….FCl>Br>I;EN ….F>Cl>Br>I;Electron gain enthalpy ….ICl>Br>I>Cl->F->Br->I-B.D.E….Cl2>Br2>F2>I2; Due to small size and repulsions between lone pairs on adjacent Fluorine atoms ;IP …..I-Cl2>Br2>I2;Hydration enthalpy…F->Cl->Br->I-;MP and BP ….F2


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