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Why chromyl chloride test is carried out...

Why chromyl chloride test is carried out in a dry test tube ?

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Because in presence of water, chromyl chloride forms the chromic acid.
`CrO_(2)Cl_(2)+2H_(2)O to H_(2)CrO_(4) +2HCl`
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RESONANCE-QUALITATIVE ANALYSIS (ANION)-Exercise-1
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