MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
Which is a radioactive substance?
Think it through first, then pick an option.
- a chromium
- b radium
- c cadmium
- d titanium
Answer and explanation
Correct answer: b radium
Radium is a radioactive substance.
Why the other options are wrong
- a chromium: Chromium (Cr) appears in this chapter as a configuration exception, not as radioactive.
- c cadmium: Cadmium is not known as a radioactive substance; radium is.
- d titanium: Titanium (Ti) is an ordinary metal, not radioactive; radium is.
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