Question

Which among the following reaction is an example of a zero order reaction?

Options

• \[\ce{C12H22O11_{(aq)} + H2O_{(l)} -> C6H12O6_{(aq)} + C6H12O6_{(aq)}}\]

• \[\ce{2NH3_{(g)} ->[Pt] N2_{(g)} + 3 H2}\]

• \[\ce{2H2O2_{(l)} -> 2H2O_{(l)} + O2_{(g)}}\]

• \[\ce{H2_{(g)} + I2_{(g)} -> 2HI_{(g)}}\]

Answer 1

\[\ce{2NH3_{(g)} ->[Pt] N2_{(g)} + 3 H2}\]

Explanation:

Decomposition of gaseous ammonia on the platinum surface at high temperature and pressure is an example of zero-order reaction. It is of the first order when the concentration of NH₃ is low.

\[\ce{2NH3_{(g)} ->[Pt catalyst] N2_{(g)} + 3H2_{(g)}}\]

Rate = k[NH₃]° = k