MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
Which of the following is a radioactive substance?
Think it through first, then pick an option.
- a zinc
- b lead
- c radium
- d mercury
Answer and explanation
Correct answer: c radium
Radium is a radioactive substance.
Why the other options are wrong
- a zinc: Zinc (Zn) is an ordinary metal, not radioactive; radium is.
- b lead: Lead is not known as a radioactive substance; radium is.
- d mercury: Mercury is not a radioactive substance; radium is.
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