When intimate mixture of potassium dichr...

When intimate mixture of potassium dichromate and potassium chloride is heated with conc.`H_(2)SO_(4)` which of the following is produced in the form of red vapours ?

`CrO_(3)`

`Cr_(2)O_(3)`

`CrO_(2)Cl_(2)`

`CrCl_(2)`

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