A mixture of NaCl and $K_2Cr_2O_7$ is heated with concentrated $H_2SO_4$, and deep red vapors are formed. Which of the following statements is false?

Question

The vapors contain $CrO_2Cl_2$ only.

The vapors give a yellow solution with NaOH.

The vapors, when passed into lead acetate in acetic acid, give a yellow precipitate.

The vapors contain $CrO_2Cl_2$ and $Cl_2$.

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