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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
Which combination forms strongest ionic bond
  • A
    $Ca^{+2}, Cl^-$
  • B
    $K^+, O^{-2}$
  • C
    $K^+, Cl^-$
  • ✓
    $Ca^{+2}, O^{-2}$
✓

Answer

Correct option: D.
$Ca^{+2}, O^{-2}$
d
Ionic bond strength depends on two things :

$a)$ Ionic charge - the greater the product of the ionic charges. the stronger the bond.

$b)$ Ionic size - the lower the sum of the anion and cation radii, the stronger the bond.

$Ca ^{+2}$ and $O ^{-2}$ ions have smaller sizes and more charges compared to the rest. They will form a stronger ionic bond.

Therefore, the correct option is $D.$

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