MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
An atom of an element has a mass of 4.482 × 10⁻²³ g. What is its relative atomic mass?
Think it through first, then pick an option.
- a 13
- b 27
- c 54
- d 32
Answer and explanation
Correct answer: b 27
4.482 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ = 27 (Al).
Why the other options are wrong
- a 13: 13 does not fit: 4.482 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ = 27.
- c 54: 54 is double 27; the quotient is exactly 27, not twice that.
- d 32: 32 does not fit; the quotient is 27.
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