MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
What is the atomic mass of Co?
Think it through first, then pick an option.
- a 68
- b 58
- c 29
- d 27
Answer and explanation
Correct answer: b 58
The atomic mass of Co is 58 (the board's value).
Why the other options are wrong
- a 68: 68 does not fit; the board's answer is 58.
- c 29: 29 does not fit; the board's answer is 58.
- d 27: 27 is Co's atomic number (proton number), not its mass.
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