JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
Given below are two statements. One is labelled as Assertion \(A\) and the other is labelled as Reason \(R\). Assertion \(A\) : The first ionization enthalpy for oxygen is lower than that of nitrogen. Reason \(R\) : The four electrons in \(2 p\) orbitals of oxygen experience more electron-electron repulsion. In the light of the above statements, choose the correct answer from the options given below.
- A Both \(A\) and \(R\) are correct and \(R\) is the correct explanation of \(A\).
- B Both \(A\) and \(R\) are correct but \(R\) is NOT the correct explanation of \(A\).
- C \(A\) is correct but \(R\) is not correct.
- D \(A\) is not correct but \(R\) is correct
Answer & Solution
Correct Answer
(A) Both \(A\) and \(R\) are correct and \(R\) is the correct explanation of \(A\).
Step-by-step Solution
Detailed explanation
Ionisation energy \(= N > O\). In oxygen atom, \(2\) of the \(42 p\) electrons must occupy the same \(2 p\) orbital resulting in an increased electron electron-repulsion.
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