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NEET levelSingle correct optionDifficulty 1 of 3ck003

Which statement about molecularity is correct?

  1. AIt can be zero or fractional, like order
  2. BIt is always equal to the overall order of any reaction
  3. CIt is determined experimentally from initial-rate data
  4. DIt is a whole number and is defined only for an elementary step

Answer: D

Molecularity counts the molecules taking part in a single elementary event, so it is a positive whole number (1, 2, 3). It is a theoretical quantity for an elementary step and cannot be zero, fractional or read off from experiments, unlike order.
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