1.

When K_(2)Cr_(2)O_(7) is heated with conc. H_(2)SO_(4) in the presence of a soluble metal chloride, orange red vapours are produced. These are due to :

Answer»

`Cr_2O_3`
`CrOCl_2`
`CrO_4^(2-)`
`CrO_2Cl_2`

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