Q.

B, Z, D and Q are the elements belonging to 17th group of Modern periodic table. The correct melting point trend in these elements is B2 > Z2 > D2 > Q2. The element ‘D’ in the sequence is

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a

I

b

Cl

c

Br

d

F

answer is B.

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Detailed Solution

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
ctaimg

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