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NEET 2022
Exam
NEET
Year
2022
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NEET 2022 · Chemistry · Classification of Elements and Periodicity in Properties

The correct order of first ionization enthalpy for the given four...

The correct order of first ionization enthalpy for the given four element is :

Options

  1. AC << N << F <O< \mathrm{O}
  2. BC<N<O<F\mathrm{C} < \mathrm{N} < \mathrm{O} < \mathrm{F}
  3. CC<O<N<F\mathrm{C} < \mathrm{O} < \mathrm{N} < \mathrm{F}
  4. DC<\mathrm{C} < F <N<O< \mathrm{N} < \mathrm{O}

Correct answer

C. C<O<N<F\mathrm{C} < \mathrm{O} < \mathrm{N} < \mathrm{F}

Step-by-step solution

<tableclass="qx−match−listqx−match−table"border="1"cellpadding="6"cellspacing="0"><tr><td>Explanation:</td><td>C</td><td>N</td><td>O</td><td>F</td></tr><tr><td>(Half−filled)</td><td>2s22p2</td><td>2s22p3</td><td>2s22p4</td><td>2s22p5</td></tr></table>Acrosstheperiod<table class="qx-match-list qx-match-table" border="1" cellpadding="6" cellspacing="0"><tr><td>Explanation:</td><td>C</td><td>N</td><td>O</td><td>F</td></tr><tr><td>(Half-filled)</td><td>2 s^2 2 p^2</td><td>2 s^2 2 p^3</td><td>2 s^2 2 p^4</td><td>2 s^2 2 p^5</td></tr></table> Across the period Z_{eff \text{eff }}increasesbutnitrogenhashalf−filledorbitalwhichmakesitmorestable.increases but nitrogen has half-filled orbital which makes it more stable.\thereforeOrderofIE1=COrder of \mathrm{IE}_{1}=\mathrm{C}< O\mathrm{O}< N\mathrm{N}< F\mathrm{F}
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