Analytical ChemistryHard
Question
Consider the reactions shown below ;
Which of the following statement (s) is/are correct ?
Which of the following statement (s) is/are correct ?
Options
A.[X] is a yellow coloured precipitate.
B.[X] is soluble in ammonia solution.
C.[Y] gives green coloured solution with excess of sodium hydroxide solution.
D.The conversion of Cr2O72- to [Y] is an redox reaction.
Solution
(A) Ag+ 2CrO42- → Ag2CrO4 ↓ (red) [X].
(B) Ag2CrO4 ↓ + 4NH3 → 2[Ag(NH3)2]+ + CrO42-.
(C) Cr3+ + 3OH- → Cr(OH)3 ↓ (green).
Cr(OH)3 + OH- → [Cr(OH)4]- (green coloured soluble complex).
(D) 3SO2+4 + Cr2+7O72- + 2H+ → 2Cr3+[Y] + 3S+6O42- + H2O.
(B) Ag2CrO4 ↓ + 4NH3 → 2[Ag(NH3)2]+ + CrO42-.
(C) Cr3+ + 3OH- → Cr(OH)3 ↓ (green).
Cr(OH)3 + OH- → [Cr(OH)4]- (green coloured soluble complex).
(D) 3SO2+4 + Cr2+7O72- + 2H+ → 2Cr3+[Y] + 3S+6O42- + H2O.
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