MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
If the actual mass of one atom of an element is 3.16 × 10⁻²³ g, what will its relative atomic mass be?
Think it through first, then pick an option.
- a 18
- b 19
- c 25
- d 27
Answer and explanation
Correct answer: b 19
3.16 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ ≈ 19 (fluorine).
Why the other options are wrong
- a 18: Not 18: 3.16 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ ≈ 19.
- c 25: 25 does not fit; the quotient is about 19.
- d 27: 27 belongs to Al (4.482 × 10⁻²³ g); this mass is 3.16 × 10⁻²³ g.
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