Which of following is not a base______________?
Correct answer: D. BF3
- A. KOH
- B. NH3
- C. PH3
- D. BF3
Explanation
BF3 is a Lewis acid because the boron atom accepts an electron pair, so it is not a base. NH3 and PH3 have lone pairs and can accept H+, although PH3 is a very weak base. Students often choose PH3 because they confuse weak basicity with absence of basic character.
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About Buffer Solutions
Buffer solutions resist changes in pH when small amounts of acid or base are added, using a weak acid and its conjugate base or a weak base and its conjugate acid. Work includes buffer action, the common-ion effect, Henderson-Hasselbalch calculations, buffer capacity, and the difference between acidic and basic buffers.
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