Chemistry - Thermochemistry Question with Solution | TestHub

${\mathrm{H}}^{+}(\mathrm{aq})+{\mathrm{OH}}^{-}(\mathrm{aq})⟶{\mathrm{H}}_2{\mathrm{O}}_{(\ell )}+57\mathrm{kJ}\Delta \mathrm{H}=57\mathrm{kJ}$ ${\mathrm{HA}}_{(\mathrm{aq})}+{\mathrm{NaOH}}_{(\mathrm{aq})}⟶{\mathrm{NaA}}_{(\mathrm{aq})}+{\mathrm{H}}_2\mathrm{O}+55\mathrm{kJ}{\Delta }_{\text{ion }}{\mathrm{H}}_{(\mathrm{HA})}=2\mathrm{kJ}$

Similarly

${\Delta }_{\text{ion }}{\mathrm{H}}_{(\mathrm{HB})}=3\mathrm{kJ}$

${\mathrm{D}}_{\text{ion }}{\mathrm{H}}_{(\mathrm{HC})}=4\mathrm{kJ}$

${\mathrm{D}}_{\text{ion }}{\mathrm{H}}_{(\mathrm{HD})}=5\mathrm{kJ}$

So we know more $\Delta {\mathrm{H}}_{\text{ion }}$ less acidic strength

(a) False $\to \mathrm{HA}>\mathrm{HB}>\mathrm{HC}>\mathrm{HD}$

(b) False $\to \Delta {\mathrm{H}}_{\text{ion }}:\mathrm{HA}<\mathrm{HB}<\mathrm{HC}<\mathrm{HD}$

(c) False $\to \Delta {\mathrm{H}}_{\text{number }}:\mathrm{HA}>\mathrm{HB}>\mathrm{HC}>\mathrm{HD}$

(d) True $\to {\mathrm{D}}_{\text{ion }}{\mathrm{H}}_{(\mathrm{HD})}+5\mathrm{kJ}$