$C r O_{3}$ liberates $C O_{2}$ with $N a_{2} C O_{3}$ solution. Thus, $C r O_{3}$ is:

an acidic oxide

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a basic oxide

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an amphoteric oxide

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a nonstoichiometric oxide

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Solution

The correct option is A an acidic oxide

Chromium Trioxide + Sodium Carbonate = Sodium Chromate + Carbon Dioxide

$C r O_{3} + N a_{2} C O_{3} \to N a_{2} C r O_{4} + C O_{2}$

Sodium carbonate is a basic salt which is reacted with $C r O_{3}$ . That indicates that $C r O_{3}$ is acidic oxide of chromium.
Hence option A is correct.

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