AP EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
In which of the following, elements are correctly arranged in the decreasing order of their second ionisation enthalpies?
- A \(\mathrm{O}>\mathrm{F}>\mathrm{N}>\mathrm{C}\)
- B \(\mathrm{N}>\mathrm{O}>\mathrm{F}>\mathrm{C}\)
- C \(\mathrm{F}>\mathrm{O}>\mathrm{N}>\mathrm{C}\)
- D \(\mathrm{C}>\mathrm{N}>\mathrm{O}>\mathrm{F}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{O}>\mathrm{F}>\mathrm{N}>\mathrm{C}\)
Step-by-step Solution
Detailed explanation
As we move across a period, effective nuclear charge \(\left(Z_{\text {eff }}\right)\) increases and so do the first ionisation energy, \(\mathrm{F}>\mathrm{O}>\mathrm{N}>\mathrm{C}\). But after the removal of 1 electron, the second ionisation potential of oxygen becomes more…
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