$K_2Cr_2O_7 +$ conc. $H_2SO_4 + NaCl \rightarrow$ red orange vapours. Here red orange vapours are of :
- A$CrO_5$
- B$CrOCl_2$
- C$CrO_2Cl_2$
- D$Cr_2(SO_4)_3$
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