MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
'X' is an element whose one atom has a mass of 3.985 × 10⁻²³ g. The relative atomic mass of 'X'
Think it through first, then pick an option.
- a 24
- b 12
- c 2.40
- d 0.024
Answer and explanation
Correct answer: a 24
3.985 × 10⁻²³ ÷ 1.66 × 10⁻²⁴ = 24.
Why the other options are wrong
- b 12: 12 is half the answer; the quotient is 24.
- c 2.40: 2.40 slips on the powers (10⁻²³ ÷ 10⁻²⁴ = 10); the answer is 24.
- d 0.024: 0.024 gets the powers badly wrong; the answer is 24.
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