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JAMB Chemistry 2011 Paper

Question : 18

Total: 47

Which of the following is NOT an alkali?

Solution:

Concept:

An alkali is a base that dissolves in water to produce hydroxide ions.

Explanation:

Alkalis are soluble bases.

\mathrm{NaOH}

and

\mathrm{Ca(OH)}_2

are soluble or sparingly soluble, and

\mathrm{NH}_3

dissolves in water to give an alkaline solution.

\mathrm{Mg(OH)}_2

is insoluble in water, so it is a base but not an alkali.

Answer:

\mathrm{Mg(OH)}_2

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