MCQ
The configuration $1{s^2},\,2{s^2}2{p^5},\,3{s^1}$ shows
- AExcited state of $O_2^ - $
- ✓Excited state of neon
- CExcited state of fluorine
- DGround state of fluorine atom
The excited neon configuration is $1{s^2}2{s^2}2{p^5}3{s^1}$.
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Assertion $(A)$ : $\mathrm{PH}_3$ has lower boiling point than $\mathrm{NH}_3$.
Reason $(R)$ : In liquid state $\mathrm{NH}_3$ molecules are associated through vander waal's forces, but $\mathrm{PH}_3$ molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below: