MCQ
The incorrect order is
- AThermal stability : $HF > HCl > HBr$
- BLewis basic character: $PF_3 < PCl_3 < PBr_3$
- ✓$\%\, p-$ character : $NO_2^+ > NO_3^- > NH_4^+$
- DBond angle : $NH_3 > PH_3 > AsH_3$
Thermal stability: $HF\, >\, HCl\, > \,HBr \,> \,HI$
The decrease in thermal stability is due to decrease in bond dissociation enthalpy.
$\Delta_{\text {diss }} H :- HF \,>\, HCl\, > \,HBr \,>\, HI$
Bond angle: $NH _3\,>\, PH _3\,>\, AsH _3$
Lewis basic character: $PF _3\,<\, PCl _3\,<\, PBr _3$
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| Rate constant | Activation energy | |
| Step $1$ | $k_1$ | $E_{a_1} = 180\,kJ /mol$ |
| Step $2$ | $k_2$ | $E_{a_2} = 80\,kJ /mol$ |
| Step $3$ | $k_3$ | $E_{a_3} = 50\,kJ /mol$ |
overall rate constant, $k = {\left( {\frac{{{k_1}{k_2}}}{{{k_3}}}} \right)^{2/3}}$ overall activation energy of the reaction will be ........ $kJ\,mol$