MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
Which has the same empirical and molecular formula?
Think it through first, then pick an option.
- a H₂O₂
- b H₂S
- c C₂H₆
- d C₂H₂
Answer and explanation
Correct answer: b H₂S
The 2 and 1 in H₂S cannot be reduced, so both formulas are the same.
Why the other options are wrong
- a H₂O₂: H₂O₂ has empirical formula HO, so the two differ.
- c C₂H₆: C₂H₆ divided by 2 gives CH₃, so the two differ.
- d C₂H₂: C₂H₂ divided by 2 gives CH, so the two differ.
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