Coordination CompoundHard
Question
Complexes [Co(NH3)5SO4]Br and [Co(NH3)5Br]SO4 can be distinguished by :
Options
A.conductance measurement
B.using BaCl2
C.using AgNO3
D.all of these
Solution
(A) [Co(NH3)5SO4]Br 
[Co(NH3)5SO4]+ (aq)+ Br- (aq)
[Co(NH3)5Br]SO4
[Co(NH3)5Br]2+ (aq) + SO42- (aq)
Both complexes have same number of ions in solutions but have different number of electrical charges. Hence they can be distinguished by conductance measurement.
(B) Br- (aq)+ Ag+ (aq) → AgBr↓ (pale yellow)
SO42- (aq.) + Ag+ → Ag2SO4 ↓ (white)
(C) Ba2+ (aq) + SO42- (aq) → BaSO4↓ (white)
Ba2+ (aq) + 2 Br- (aq) → BaBr2 (aq).
[Co(NH3)5SO4]+ (aq)+ Br- (aq)[Co(NH3)5Br]SO4
[Co(NH3)5Br]2+ (aq) + SO42- (aq)Both complexes have same number of ions in solutions but have different number of electrical charges. Hence they can be distinguished by conductance measurement.
(B) Br- (aq)+ Ag+ (aq) → AgBr↓ (pale yellow)
SO42- (aq.) + Ag+ → Ag2SO4 ↓ (white)
(C) Ba2+ (aq) + SO42- (aq) → BaSO4↓ (white)
Ba2+ (aq) + 2 Br- (aq) → BaBr2 (aq).
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