Which of the following statement(s) is/are not correct?
A. Nickel salts give rosy red precipitate with dimethyl glyoxime in excess of `NH_(4)OH`
B. `Fe(III)` salts give red colour with potassium sulphocyanide
C. In nitroprusside the iron and `NO` exists as `Fe(III)` and `NO`
D. `Mn (II)` salts give white precipitate with `NaOH` which turns brown on adding `Br_(2)` water.