MCQ
In the $n^{th}$ quantum level, the number of electronic subshell is
- ✓$n$
- B$2n^2$
- C$2n$
- D$2 \times (2l + 1)$
No. of substell $=n$
Eg for $n=2$
No of Subshell $=2$ which are $2s$ and $2 p$
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$STATEMENT$-$2$: In water, orthoboric acid acts as a proton donor.

$(A)$ $O$ - $O$ bond lengths are equal.
$(B)$ Thermal decomposition of $O _3$ is endothermic.
$(C)$ $O _3$ is diamagnetic in nature.
$(D)$ $O _3$ has a bent structure.