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Which of the following is not an alkali - JAMB Chemistry 2016 Question

Which of the following is not an alkali?

A
Ca(OH)2
B
NH3
C
NaOH
D
Al(OH)3
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Correct Option: B

An alkali is a basic, ionic salt of an alkali metal or alkaline earth metal. It dissolves in water to form hydroxide ions (OH-).

  • A. Ca(OH)2 is calcium hydroxide, an alkaline earth metal hydroxide, and thus an alkali.
  • B. NH3 (ammonia) is a base that reacts with water to produce hydroxide ions (OH-), so it is an alkali.
  • C. NaOH is sodium hydroxide, an alkali metal hydroxide, and thus an alkali.
  • D. Al(OH)3 is aluminum hydroxide. While it contains the hydroxide group, aluminum hydroxide is amphoteric, meaning it can act as both an acid and a base. It is not a strong base and is therefore not considered an alkali.
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