The correct statement(s) is /are :
(A) titan yellow solution gives red colouration with a neutral solution containing Mg+2 ions
(B) solution of nitrite is decomposed by sulphamic acid.
(C) Fe2+ ions give brown colour precipitate with [Fe(CN)6]3 – ions solution.
(D) Green precipitate of Cr(OH)3 is soluble in Na2O2