MCQ practice · SSC Chemistry Board questions · Chapter 12: Chemistry in Our Lives
Which is the formula of urea?
Think it through first, then pick an option.
- a NH₄CNO
- b NH₄CN
- c (NH₂)₂CO
- d (NH₄)₂CO
Answer and explanation
Correct answer: c (NH₂)₂CO
Urea is NH₂-CO-NH₂, that is, (NH₂)₂CO.
Why the other options are wrong
- a NH₄CNO: This is ammonium cyanate; urea is (NH₂)₂CO.
- b NH₄CN: This has no oxygen; urea is NH₂-CO-NH₂, which has O.
- d (NH₄)₂CO: Urea has NH₂ groups, not NH₄: NH₂-CO-NH₂.
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