Select the process in which the least enthalpy change is associated:

  • A
    $O_{(g)} \to O^{+}_{(g)}$
  • B
    $O_{(g)} \to O^{-}_{(g)}$
  • C
    $O^{+}_{(g)} \to O^{2+}_{(g)}$
  • D
    $S_{(g)} \to S^{-}_{(g)}$

Explore More

Similar Questions

Which of the following statements regarding electron affinity is correct?

Increasing order of electron affinity is

The process requiring the absorption of energy is

The formation of the oxide ion,$O^{2-}_{(g)}$,from oxygen atom requires first an exothermic and then an endothermic step as shown below:
$O_{(g)} + e^- \to O^{-}_{(g)} ; \Delta_f H^{\Theta} = -141 \ kJ \ mol^{-1}$
$O^{-}_{(g)} + e^- \to O^{2-}_{(g)} ; \Delta_f H^{\Theta} = +780 \ kJ \ mol^{-1}$
Thus,the process of formation of $O^{2-}$ in gas phase is unfavourable even though $O^{2-}$ is isoelectronic with neon. It is due to the fact that,

Which of the following transformations requires the least amount of energy?

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo