- A$PBr_5$
- B$N_2O_5$
- C$Na_2SO_4$
- ✓$H_2O$
$PBr_5$ exists as $PBr_4^+$ & $Br^-$
$N_2O_5$ exists as $NO_3^-$ & $NO_2^+$
$Na_2SO_4$ exists as $Na^+$ & $SO_4^{2-}$
$H_2O$ exist as $H_2O$ only
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$(a)$ Heat of combustion reaction
$(b)$ Heat of formation reaction
$(c)$ An exothermic reaction
$(d)$ Not neutralization reaction
$(a)$ Peroxide ion as well as dioxygen molecule both are paramagnetic species
$(b)$ In set of isomers, $[Cr(H_2O)_6]Cl_3$ and $[CrCl(H_2O) _5]Cl_2 . H_2O,$ both compounds can easily loose water molecule on treatment with cone. $H_2SO_4$
$(c)$ During transformation $NO \to NO^+$ , bond length and magnetic behaviour decreases
$(d)$ An ether is more volatile than alcohol both having same molecular formula
