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Answer the following: A patient was given a certain amount of iodine-131 as a part of a diagnostic…

Chemistry20253 marksShort answer
Answer the following:
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(a)
A patient was given a certain amount of iodine-131 as a part of a diagnostic procedure for thyroid disorder. Given that the half-life of radioactive $^{131}\text{I}$ is 8 days, what fraction of the initial $^{131}\text{I}$ would be present in a patient after 32 days if none of it were eliminated through natural body processes?
(b)
The potential energy diagram, for a multistep reaction is given below: (i) Which step will be the rate determining step of the reaction? (ii) Which step is faster $\text{A} \rightarrow \text{B}$ or $\text{B} \rightarrow \text{C}$?

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Chemical Kinetics

From ISC 2025 Practice Chemistry, question 67.