MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
What is the lifetime of Tc-99 in hours?
Think it through first, then pick an option.
- a 6
- b 8
- c 11
- d 12
Answer and explanation
Correct answer: a 6
The book: ⁹⁹Tc has a lifetime of 6 hours.
Why the other options are wrong
- b 8: Not 8: the book gives 6 hours, which is why it is safe.
- c 11: Not 11: the book gives 6 hours, which is why it is safe.
- d 12: Not 12: the book gives 6 hours, which is why it is safe.
Your account is open, so all 30,000+ MCQs from every chapter are yours. Start practising SSC Chemistry →
Want to keep going?
A free account carries you on to the next questions and opens 30,000+ MCQs from every chapter. Join before launch and Chirkut bundles are 60% off.
The ones you missed, worth one more look