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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
In the case of alkali metals, the covalent character decreases in the order
  • ✓
    $MI > MBr > MCl > MF$
  • B
    $MCl > MI > MBr > MF$
  • C
    $MF > MCl > MBr > MI$
  • D
    $MF > MCl > MI > MBr$
✓

Answer

Correct option: A.
$MI > MBr > MCl > MF$
a
Fajan's rule states that the covalent character increases with the decrease in the size of the cation and increases with the increase in the size of the anion.

Since we know that the size increases on going down the group, the order of size will be:

$I ^{-} \,>\, Br ^{-}\,>\, Cl ^{-}\,>\, F ^{-}$

According to Fajan's rule, the covalent character increases with the increase in the size of the anion.

$\therefore$ the order of covalent character will be:

$MI\, >\, MBr\, >\, MCl \,>\, MF$

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