Which one of the following oxide is also called chromic acid?

C r O_{2}

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C r_{2} O_{3}

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C r O_{3}

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C r O

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Solution

The correct option is B $C r O_{3}$
Option (C) is correct.
$C r O_{3}$ is also called chromic acid.
It is also called anhydride of chromic acid. It is water soluble, giving a red solution. This red solution is strongly acidic and contains several chromic acids. The simplest of these acids is $H_{2} C r O_{4}$ .

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