MCQ
Dative bond is present in
- A$O_3$
- B$NH_3$
- ✓$BaCl_2$
- D$BI_3$
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Compounds $X$ and $Y $ are
| Period number | Group number | |
| $P$ | $2$ | $15$ |
| $Q$ | $3$ | $2$ |
Then formula of the compound formed by $P$ and $Q$ element is