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When a mixture of NaCl, K2Cr2O7 and conc...

When a mixture of NaCl, `K_2Cr_2O_7` and conc. `H_2SO_4` is heated in a dry test tube, a red vapour (X) is evolved. This vapour (X) turns an aqueous solution of NaOH yellow due to the formation of Y. X and Y. respectively. are:

A

`CrCl_3 and Na_2Cr_2O_7`

B

`CrCl_3 and Na_2CrO_4`

C

`CrO_2 Cl_2 and Na_2CrO_4`

D

`Cr_(2)(SO_4)_3 and Na_2Cr_2O_7`

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