Analytical ChemistryHard
Question
Which of the following statement(s) is/are true?
Options
A.Titan yellow solution gives red colouration with a neutral solution containing Mg2+ 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.
Solution
(A) Red colour solution or precipitate is produced when reagent reacts in alkaline solution.
(B) HO.SO2.NH2 + HNO2 → N2 + 2H+ + SO42- + H2O.
(C) Fe2+ + [Fe(CN)6]3- → Fe3+ + [Fe(CN)6]4-.
4Fe3+ + [Fe(CN)6]4- → Fe4[Fe(CN)6]3 ↓ (Turnbull′s blue).
(D) 4Cr(OH)3 ↓ + 5O22- → 4CrO42- (yellow solution) + 6H2O.
(B) HO.SO2.NH2 + HNO2 → N2 + 2H+ + SO42- + H2O.
(C) Fe2+ + [Fe(CN)6]3- → Fe3+ + [Fe(CN)6]4-.
4Fe3+ + [Fe(CN)6]4- → Fe4[Fe(CN)6]3 ↓ (Turnbull′s blue).
(D) 4Cr(OH)3 ↓ + 5O22- → 4CrO42- (yellow solution) + 6H2O.
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