Analytical ChemistryHard
Question
Consider the following statements,
S1 : zinc hydroxide is soluble in sodium hydroxide but not in ammonia solution.
S2 : Cd(OH)2 is soluble in sodium hydroxide as well as in ammonia solution.
S3 : Cu2+ ions like Fe3+ ions give deep red colouration with SCN- ions.
S4 : Fe2+ ions give red colouration with dimethylglyoxime in ammonical solution.
and arrange in the order of true / false.
S1 : zinc hydroxide is soluble in sodium hydroxide but not in ammonia solution.
S2 : Cd(OH)2 is soluble in sodium hydroxide as well as in ammonia solution.
S3 : Cu2+ ions like Fe3+ ions give deep red colouration with SCN- ions.
S4 : Fe2+ ions give red colouration with dimethylglyoxime in ammonical solution.
and arrange in the order of true / false.
Options
A.T F T T
B.F F F T
C.T T T T
D.T F T F
Solution
S1 : Zn(OH)2 is soluble in both forming soluble complex [Zn(OH)4]2- and [Zn(NH3)]2+.
S2 : Cd(OH)2 is soluble in ammonia forming colourless [Cd(NH3)4]2+ but it is not soluble in excess of NaOH.
S3 : Cu2+ + 3SCN- → CuSCN ↓ (white) + (SCN)2 ↑
Fe3+ + 3SCN- → Fe(SCN)3 (red)
S4 : DMG gives soluble red iron(II) dimethylglyoxime.
S2 : Cd(OH)2 is soluble in ammonia forming colourless [Cd(NH3)4]2+ but it is not soluble in excess of NaOH.
S3 : Cu2+ + 3SCN- → CuSCN ↓ (white) + (SCN)2 ↑
Fe3+ + 3SCN- → Fe(SCN)3 (red)
S4 : DMG gives soluble red iron(II) dimethylglyoxime.
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