Base properties of amines Quiz
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5 questions, one answer each
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1. Why does an amine act as a base?
- A. It has a lone pair on N that accepts H⁺
- B. It releases OH⁻ from its own structure
- C. It has a delocalised ring
- D. It contains an acidic N–H bond
2. Which solution of equal concentration has the highest pH?
- A. Phenylamine
- B. Ammonia
- C. Ethylamine
- D. Water
3. Why is phenylamine a weaker base than ammonia?
- A. The lone pair is delocalised into the ring
- B. It has a larger Mr
- C. It has more hydrogen atoms
- D. The ring pushes electrons onto nitrogen
4. What is the effect of an alkyl group on the base strength of an amine, and why?
- A. It decreases it by withdrawing electrons
- B. It increases it by releasing electron density to N
- C. It has no effect
- D. It decreases it by blocking the lone pair
5. A 0.100 mol dm⁻³ ammonia solution has pH 11.1. About what percentage of the ammonia molecules has accepted a proton? (Kw = 1.00 × 10⁻¹⁴)
- A. 0.126%
- B. 1.26%
- C. 12.6%
- D. 100%