Explain chromyl chloride test with equation.

Explanation:
Chromyl chloride test is used of the confirmation for Cl- ion.

Equation-

                NaCl              +         H2SO4                    NaHSO4        +       HCl

               K2Cr2O7       +         2H2SO4                   2KHSO4     +     2CrO3    +     H2O

CrO3(s)          +        2HCl(aq)                  CrO2Cl2(g)      +       H2O(l)
                    (Chromium trioxide) (Hydrochloric acid)      (Chromyl chloride)    (Water)
                                                      
Red color fumes of chromyl chloride are a confirmation of chloride ions in that specific salt.