KCET · Chemistry · Thermodynamics (C)
Generally, the first ionization energy increases along a period. But there are some exceptions. One which is not an exception is
- A \(\mathrm{N}\) and \(\mathrm{O}\)
- B \(\mathrm{Na}\) and \(\mathrm{Mg}\)
- C \(\mathrm{Mg}\) and \(\mathrm{Al}\)
- D Be and B
Answer & Solution
Correct Answer
(B) \(\mathrm{Na}\) and \(\mathrm{Mg}\)
Step-by-step Solution
Detailed explanation
Na belongs to IA group and Mg belongs to IIA group. On moving form left to right in a period, first ionization energy increases, thus, IE of \(\mathrm{Mg}\) is greater than the IE of Na.
IE order \(\mathrm{Mg}>\mathrm{Na}\)
IE order \(\mathrm{Mg}>\mathrm{Na}\)
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