Q55 / 160 · JIPMER 2010 · Chemistry

Which of the following relation is correct ?

  • Correct answer
    A
    $\mathrm{I}^{\text {st }}$ IE of C $\gt\mathrm{I}^{\text {st }}$ IE of B
  • B
    $\mathrm{I}^{\text {st }}$ IE of $\mathrm{C} \lt \mathrm{I}^{\text {st }}$ IE of B
  • C
    $\mathrm{II}^{\text {nd }} \mathrm{IE}$ of $\mathrm{C}\gt\mathrm{II}^{\text {nd }} \mathrm{IE}$ of B
  • D
    Both (b) and (c)

Solution

The minimum amount of energy required to remove the most loosely bound electron from an isolated gaseous atom so as to convert it into a gaseous cation, is called its ionisation energy. Because the size of $C$ is smaller than that of the $B$ due to effective nuclear charge, hence $\mathrm{I}^{\text {st }} \mathrm{IE}$ of $\mathrm{C}\gt\mathrm{I}^{\text {st }}$ IE of B

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

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