MCQ
Which of the following ions are optically active?


- A$I$ only
- B$II$ only
- ✓$II$ and $III$
- D$IV$ only

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the time taken for $75 \%$ reaction of $P$ is twice the time taken for $50 \%$ reaction of $P$. The concentration of $Q$ varies with reaction time as shown in the figure. The overall order of the reaction is