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Question
Answer both parts (i) and (ii).
(i) What are isotopes? Give examples. Describe the medical applications of the following isotopes: Technicium-99, Iodine-125, Sodium-24, and Helium-3. Word limit: (400 words)
[50 marks]
(ii) Balance the following redox reaction equation, which takes place in acidic solution,
Cr2O72- (aq) + HNO2 (aq) -----> Cr3+ (aq) + NO3- (aq)
Sample Solution