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NEET 2024
Exam
NEET
Year
2024
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NEET 2024 · Chemistry · Classification of Elements and Periodicity in Properties

Arrange the following elements in increasing order of first...

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

Options

  1. ALi<B<Be<C<N\mathrm{Li} \lt \mathrm{B} \lt \mathrm{Be} \lt \mathrm{C} \lt \mathrm{N}
  2. BLi<Be<C<B<N\mathrm{Li} \lt \mathrm{Be} \lt \mathrm{C} \lt \mathrm{B} \lt \mathrm{N}
  3. CLi<Be<N<B<C\mathrm{Li} \lt \mathrm{Be} \lt \mathrm{N} \lt \mathrm{B} \lt \mathrm{C}
  4. DLi<Be<\mathrm{Li} \lt \mathrm{Be} \lt B <\lt C <\lt N

Correct answer

A. Li<B<Be<C<N\mathrm{Li} \lt \mathrm{B} \lt \mathrm{Be} \lt \mathrm{C} \lt \mathrm{N}

Step-by-step solution

Increasing order of first ionization enthalpy is Li<B<Be<C<N\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}$
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