Which of the following statement is correct when a mixture of `CaCl_(2) and K_(2)Cr_(2)O_(7)` is gently warmed with conc . `H_(2)SO_(4)` acid ?
A. Deep red vapours are evolved
B. The vapours when passed into NaOH solution gives a yellow solution of `Na_(2)CrO_(4)`
C. Chlorine gas is evolved
D. Chromyl chloride is formed
