Hydrogen and its compoundHard

Question

Which of tho following statenment (s) is (are) correct, when a mixture of NaCl and K2Cr2O7 is gently warmed with conc H2SO4 ?

Options

A.A deep red vapours is evolved
B.The vapours when passed into NaOH solution gives a yellow solution of Na2CrO4
C.Chlorine gas is evolved
D.Chromyl chloride is formed

Solution

K2Cr2O7 + 2H2SO4 2KHSO4 + 2CrO3 + H2O
                        conc.
CrO3 + 2NaCl → CrO2Cl2 ↑ + H2O
                        Red vapours (Chromyl chloride)
CrO2Cl2 + 4NaOH → Na2CrO4 + 2NaCl + 2H2O
                                           yellow

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