Analytical ChemistryHard
Question
Na2 SO4 + BaCl2 → White precipitate 
Aqueous solution. 
Gas ′G′ is evolved
The gas ′G′ will show which of the following property ?
Aqueous solution. Gas ′G′ is evolvedThe gas ′G′ will show which of the following property ?
Options
A.It turns lead acetate filter paper black.
B.It turns acidified K2Cr2O7 filter paper green.
C.It produces purple colouration on filter paper moistened with sodium nitroprusside already made alkaline with sodium hydroxide.
D.All of these
Solution
(A) Pb2+ + H2S → PbS ↓ (black) + 2H+.
(B) Cr2O72- + 3H2S + 8H+ → 2Cr3+ (green colour solution) + 3S↓ + 7H2O.
(C) S2- + [Fe(CN)5NO]2- → [Fe(CN)5NOS]4- (purple colouration).
Reactions : Na2SO4 + BaCl2 → BaSO4 ↓ + NaCl.
BaSO4 + 4C + Na2CO3
Na2S + BaCO3 ↓ + 4CO ↑.
Na2S + H2SO4 → Na2SO4 + H2S.
(B) Cr2O72- + 3H2S + 8H+ → 2Cr3+ (green colour solution) + 3S↓ + 7H2O.
(C) S2- + [Fe(CN)5NO]2- → [Fe(CN)5NOS]4- (purple colouration).
Reactions : Na2SO4 + BaCl2 → BaSO4 ↓ + NaCl.
BaSO4 + 4C + Na2CO3
Na2S + BaCO3 ↓ + 4CO ↑.Na2S + H2SO4 → Na2SO4 + H2S.
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