JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ? \((A)\) \(Rb\) and \(Cs\) \((B)\) \(Na\) and \(K\) \((C)\) \(Ar\) and \(Kr\) \((D)\) \(I\) and \(At\) Choose the correct answer from the options given below.
- A \((A)\) and \((B)\) only
- B \((B)\) and \((C)\) only
- C \((A)\) and \((C)\) only
- D \((C)\) and \((D)\) only
Answer & Solution
Correct Answer
(C) \((A)\) and \((C)\) only
Step-by-step Solution
Detailed explanation
\(Rb\) and \(Cs\) have nearly same electron gain enthalpy electron gain enthalpy \(=-46\,kj / ml\) \(Ar\) and \(Kr\) have same \(\Delta H _{ eq }\). Value is \(+96\,kj / ml\)
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