Q76 / 200 · NEET 2024 · Chemistry

Arrange the following elements in increasing order of first ionization enthalpy: $\mathrm{Li}, \mathrm{Be}, \mathrm{B}, \mathrm{C}, \mathrm{N}$ Choose the correct answer from the options given below:

  • Correct answer
    A
    $\mathrm{Li} \lt \mathrm{B} \lt \mathrm{Be} \lt \mathrm{C} \lt \mathrm{N}$
  • B
    $\mathrm{Li} \lt \mathrm{Be} \lt \mathrm{C} \lt \mathrm{B} \lt \mathrm{N}$
  • C
    $\mathrm{Li} \lt \mathrm{Be} \lt \mathrm{N} \lt \mathrm{B} \lt \mathrm{C}$
  • D
    $\mathrm{Li} \lt \mathrm{Be} \lt $ B $ \lt $ C $ \lt $ N

Solution

Increasing order of first ionization enthalpy is $\mathrm{Li} \lt \mathrm{B} \lt \mathrm{Be} \lt \mathrm{C} \lt \mathrm{N}$ $\begin{array}{|c|c|}\hline \text{Element} & \begin{array}{l} \text{First ionization enthalpy} \\ \left(\Delta_{\mathrm{i}} \mathrm{H} / \mathrm{kJ} \mathrm{mol}^{-1}\right. )\end{array} \\ \hline Li & 520 \\ \hline Be & 899 \\ \hline B & 801 \\ \hline C & 1086 \\ \hline N & 1402 \\ \hline\end{array}$

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

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