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Chemical Kinetics — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryChemical Kinetics2 Marks
Question
Give examples of first order reaction.
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Answer

→ Hydrogenation of ethene is an example of first order reaction.
$\begin{array}{l} C _2 H _4(g)+ H _2(g) \rightarrow C _2 H _6(g) \\ \text { Rate }= k \left[ C _2 H _4\right]\end{array}$
All natural and artificial radioactive decay of unstable nuclei take place by first order kinetics. $
\begin{array}{l}
{ }_{88}^{226} Ra \rightarrow{ }_2^4 He \ +\ { }_{86}^{222} Rn \\
\text { Rate }= k [ Ra ]
\end{array}
$
Decomposition of $N _2 O _5$ and $N _2 O$ are some more examples of first order reactions.

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