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In the reaction NaCl+K2Cr2O7+Conc. H2SO4...

In the reaction `NaCl+K_2Cr_2O_7+Conc. H_2SO_4 overset (heat) rarr X+Na_2SO_4+K_SO_4+H_2O`, 'X' is a reddish brown gas which gives a yellow solution on passing through water and a yellow pracipitate on treating the solution with lead acetate solution. So 'X' could be

A

`Cl_2`

B

`Cr_2O_3`

C

`H_2CrO_4`

D

`CrO_2Cl_2`

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