Which of the following statements is `//` are correct
A. `SbCl_(3)` gives chromyl chloride test along with `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)`
B. Chronyl chloride on reaction with NaOH gives chromate ion.
C. Chromate ion convert to the dichromate ion in acidic medium.
D. there is no change in oxidation no. during conversion chromate ion to dichromate ion.
