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Properties and Uses of Calcium Oxide

Question

Which one of the following oxides is soluble in water?
Ferric oxide
Ferrous oxide
Zinc oxide
Calcium oxide

A

Zinc oxide

B

Calcium oxide

C

Ferrous oxide

D

Ferric oxide

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Solution

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Calcium Oxide dissolves in water and form Calcium hydroxide.
$C a O + H_{2} O \to C a (O H)_{2}$

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