Question

Give a chemical reaction in which a catalyst is used.

Answer 1

E.g. In the hydrogenation of ethene, nickel or platinum is used as catalyst.

\[\begin{array}{cc}
\phantom{................................}\ce{H}\phantom{...}\ce{H}\\
\phantom{................................}|\phantom{....}|\\
\ce{H - C = C - H \underset{\text{Hydrogen}}{+ H - H} ->[Ni/Pt] H - C - C - H}\\
|\phantom{.....}|\phantom{..........................}|\phantom{....}|\\
\ce{\phantom{.}\underset{\text{Ethene}}{H \phantom{...}H}}\phantom{.........................}
\ce{\underset{\text{Ethane}}{H \phantom{...}H}}
\end{array}\]