MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
Which has the highest relative molecular mass?
Think it through first, then pick an option.
- a H₂SO₄
- b HNO₃
- c H₂CO₃
- d HCl
Answer and explanation
Correct answer: a H₂SO₄
H₂SO₄ = 98, more than HNO₃ (63), H₂CO₃ (62) and HCl (36.5).
Why the other options are wrong
- b HNO₃: HNO₃ = 1 + 14 + 48 = 63, less than H₂SO₄ at 98.
- c H₂CO₃: H₂CO₃ = 2 + 12 + 48 = 62, less than H₂SO₄ at 98.
- d HCl: HCl = 36.5, the lowest of the four; the highest is H₂SO₄ (98).
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