Experiment to study kinetics of the dissociation of hydrogen peroxide must be performed by group of two or three so that-

• Correct answer
  A

  when one is recording data other should be swirling flask at constant rate.
• B

  experiment can be performed by one student only as outcomes are independent on rate of mixing of mixture 1 and 3 .
• C

  for safety purpose.
• D

  none of these.

Hence, the correct answer is option: 'A'.