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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ck110

The gas-phase decomposition of shows a half-life of when the initial pressure is and again when it is . Take and . Select the correct statement(s).

  1. AThe reaction is first order.
  2. BThe time for 75% decomposition is .
  3. CThe rate constant is .
  4. DThe time for 90% decomposition is .

Answer: A, C, D

A half-life independent of the initial pressure indicates first order, with . For 75% decomposition two half-lives are needed, 200 s (not 300 s). For 90%, .
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