Q10 / 100 · BITSAT 2024 (Memory Based Paper 3) · Chemistry

The ionic radii in $(Ã…)$ of $\mathrm{N}^{3-}, \mathrm{O}^{2-}$ and $\mathrm{F}^{-}$are respectively.

  • Correct answer
    A
    1.71, 1.40 and 1.36
  • B
    1.71, 1.36 and 1.40
  • C
    $1.36,1.40$ and 1.71
  • D
    $1.36,1.71$ and 1.40

Solution

$\mathrm{N}^{3-}, \mathrm{O}^{2-}$ and $\mathrm{F}^{-}$are isoelectronics ( 10 electrons) species. Their ionic radii will decrease with increase in magnitude of the nuclear charge from $\mathrm{N}(\mathrm{Z}=7)$ to O $(Z=8)$ and $F(Z=9)$. i.e. $\begin{array}{ccc} \mathrm{N}^{3-}\gt & \mathrm{O}^{2-}\gt&\mathrm{F}^{-} \\ 1.71 Ã… & 1.40 Ã… & 1.36 Ã… \end{array}$ Hence, option (1) is correct.

Hence, the correct answer is option: 'A'.

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