MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
Compounds with the empirical formula 'CH':
- i. ethyne
- ii. benzene
- iii. naphthalene
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: a i and ii
Ethyne is C₂H₂ and benzene is C₆H₆, both 1 : 1, empirical formula CH; naphthalene, C₁₀H₈, gives C₅H₄.
Why the other options are wrong
- b i and iii: iii is false: naphthalene, C₁₀H₈, divides by 2 to give C₅H₄, not CH; and ii is left out.
- c ii and iii: iii is false: the empirical formula of C₁₀H₈ is C₅H₄; and i is left out.
- d i, ii and iii: iii is false: in naphthalene C : H = 10 : 8 = 5 : 4.
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