Question

MATCH THE FOLLOWING :

Column (A)	Column (B)
(a) Fe3+, Zn2+ & Cu2+ can be differentiated by	(i) KI solution
(b) PbS,CuS and CdS dissolve in	(ii) Alkaline Na2SnO2 solution
(c) Pb2+ gives yellow precipitate with	(iii) 50% HNO3
(d) Bi3+ gives a black precipitate with	(iv) K2CrO4 solution
(e) [Ag(NH3)2]Cl gives back precipitate with	(v) Aqueous NH3

Answer 1

(a – v), 

(b – iii),

(c – i, iv),

Pb²⁺ + 2 KI → PbI₂ ↓ (yellow) + 2 K+ ; Pb²⁺ + K₂CrO₄ → PbCrO₄ ↓ (yellow) + 2 K⁺, 

(d – i,ii), 

Bi³⁺ + 3 KI → BiI₃ ↓ (black) + 3 K⁺ 

BiCl₃ + 3 Na₂SnO₂ + 6 NaOH → 2 Bi ↓ (black) + 3 Na₂SnO₃ + 6 NaCl + 3 H₂O

(e – i,iii,iv), 

[Ag(NH₃)₂]Cl + KI → AgI ↓ (yellow) + 2 NH₃ + KCl 

[Ag(NH₃)₂]Cl + 2 HNO₃ → AgCl ↓ (white) + 2 NH₄NO₃ 

[Ag(NH₃)₂]Cl + K₂CrO₄ → Ag₂CrO₄ ↓ (red) + 4 NH₃ + 2 KCl