From the given compounds, number of compounds acidic in water is ______.
$CaO, {SO}_{2}, {SO}_{3}, {Fe}_{2} O_{3}, {Cl}_{2} O_{7}, {CO}_{2}, {Na}_{2} O$ .

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answer is 4.

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Detailed Solution

Metallic oxides are known to show basic nature. On the other hand, non-metallic oxides are observed to show acidic properties.

${SO}_{2}, {SO}_{3}, {Cl}_{2} O_{7}, {CO}_{2}$ are acidic in nature, so total 4.

$CaO, {Na}_{2} O$ are basic in nature.

${Fe}_{2} O_{3}$ is amphoteric in nature.

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