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BECE Science 2011 Paper

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Question : 16

Total: 40

Which of the following substances is a salt?

$\mathrm{H}_2\mathrm{SO}_4$
$\mathrm{NaOH}$
$\mathrm{HCl}$
$\mathrm{CaCl}_2$

Solution:

Concept:

A salt is formed when an acid reacts with a base to produce water and a compound made of a positive ion (other than

\mathrm{H^+}

) and a negative ion (other than

\mathrm{OH^-}

).

Explanation:

•

\mathrm{H}_2\mathrm{SO}_4

is an acid.

•

\mathrm{NaOH}

is a base.

•

\mathrm{HCl}

is an acid.

•

\mathrm{CaCl}_2

is made of

\mathrm{Ca^{2+}}

and

\mathrm{Cl^-}

, so it is a salt.

Answer:

\mathrm{CaCl}_2

is a salt.

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