MCQ
The given reaction $2NO + {O_2} \to 2N{O_2}$ is an example of
- AFirst order reaction
- BSecond order reaction
- ✓Third order reaction
- DNone of these
${\rm{Rate}} = {\rm{K[NO}}{{\rm{]}}^{\,\,{\rm{2}}}}{[{O_2}]^{\,1}}$
$\therefore $ O.R. $= 2 + 1 = 3$
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$CH _{3} COOH + NaOH \rightarrow CH _{3} COONa + H _{2} O$ $(\Delta H =-55.3\,kJ\,mol ^{-1})$ The enthalpy of ionization of $CH _{3} COOH$ as calculated by the student is $kJ mol ^{-1}$. (nearest integer)


| $t/s$ | $0$ | $30$ | $60$ | $90$ |
| $ Ester/$ $mol\,L^{-1}$ | $0.55$ | $0.31$ | $0.17$ | $0.085$ |
What will be the average rate of reaction between the time interval $30$ to $60\, seconds$ ?
The above reaction is classified as