MCQ
he classical smog was first observed in :
- ✓London
- BTokyo
- CParis
- DNew york
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Assertion $(A)$ : Boron is unable to form $BF _{6}^{3-}$
Reason $(R)$ : Size of $B$ is very small.
In the light of the above statements, choose the correct answer from the options given below.


(Image)
$A$ and $B$ respectively are: