AP EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
In which of the following the electron gain enthalpy of elements is correctly arranged?
- A S \( > \) Se \( > \) Te \( > \mathrm{O}\)
- B \(\mathrm{F} > \mathrm{Cl} > \mathrm{Br} > 1\)
- C \(\mathrm{Na} > \mathrm{L} > \mathrm{K} > \mathrm{Rb}\)
- D \(\mathrm{O} > \mathrm{S} > \mathrm{Se} > \mathrm{Te}\)
Answer & Solution
Correct Answer
(A) S \( > \) Se \( > \) Te \( > \mathrm{O}\)
Step-by-step Solution
Detailed explanation
On moving down the group electron gain enthalpy decreases. Oxygen due to its small size causes electron-electron repulsions in relatively small \(2 p\)-subshell. Hence, incoming electrons cannot allow to enter easily, as in case of other elements of this group that's why oxygen…
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