Potassium dichromate (\(\text{K}_2\text{Cr}_2\text{O}_7\)) is a strong oxidizing agent. Select the correct statements from the following:
(A) It is used for preparation of many azo compounds.
(B) With the decreasing pH of the solution, dichromates changes into chromates.
(C) In acidified solution equivalent weight of dichromate is M/5
(D) The bond angle between Cr-O-Cr is \(126^\circ\).
Choose the correct answer from the options given below: