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Give reasons for following in one or two...

Give reasons for following in one or two sentences:
`CrO_3` is an acid anhydride?

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`CrO_3` is an acid anhydride When it is added to water, it forms chromic acid. So it is the anhydride of chromic acid.
`CrO_3+H_2OtoH_2CrO_4`
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