MCQ
The molecule/ion with square pyramidal shape is:
- A$\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$
- B$\mathrm{PCl}_5$
- ✓$\mathrm{BrF}_5$
- D$\mathrm{PF}_5$

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$(a)$ Heat of combustion reaction
$(b)$ Heat of formation reaction
$(c)$ An exothermic reaction
$(d)$ Not neutralization reaction