MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
An atom of an element has a mass of 3.16 × 10⁻²³ g. What is its relative atomic mass?
Think it through first, then pick an option.
- a 9
- b 19
- c 27
- d 32
Answer and explanation
Correct answer: b 19
3.16 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ ≈ 19 (fluorine).
Why the other options are wrong
- a 9: 9 does not fit: 3.16 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ ≈ 19.
- c 27: 27 belongs to Al (4.482 × 10⁻²³ g); this mass is 3.16 × 10⁻²³ g.
- d 32: 32 does not fit; the quotient is about 19.
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