Multiple choice general knowledge science & technology

Which of the following is not a first order reaction.

  1. H2O2 => H2O + 0.5 O2

  2. SO2Cl2 => SO2 + Cl2

  3. 2 N2O2 => 4 NO2 + O2

  4. 2 NO2 => 2 NO + O2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Options A (H2O2 decomposition) and B (SO2Cl2 decomposition) are classic first-order reactions. Option D (2NO2 decomposition) is second-order because rate depends on [NO2]². Option C uses an incorrect formula (N2O2 is not stable; should be N2O5 for first-order decomposition), making it the 'not first-order reaction' by being chemically invalid.

Keep practicing — related questions