In how many of the following reactions one of the products is obtained as a black precipitate ?
(i) $B i (O H)_{3} ↓ + [S n (O H)_{4}]^{2 -} (a q) ⟶ P r o d u c t s$
(ii) $B i^{3 +} (a q) + I^{-} (a q) (n o t i n e x c e s s) ⟶ P r o d u c t s$
(iii) $A g^{+} (a q) + H_{2} S (g) H^{+} - - \to P r o d u c t s$
(iv) $[B i I_{4}]^{-} (a q) + H_{2} O (l) D i l u t i o n - ---- \to P r o d u c t s$

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Solution

(i) $B i (O H)_{3} ↓ + [S n (O H)_{4}]^{2 -} (a q) ⟶ B i_{2} S n O_{3} ↓ (b l a c k p r e c i p i t a t e) + H_{2} O$

(ii) $B i^{3 +} (a q) + I^{-} (a q) (n o t i n e x c e s s) ⟶ B i I_{3} ↓ (b l a c k p r e c i p i t a t e)$

(iii) $2 A g^{+} (a q) + H_{2} S (g) H^{+} - - \to A g_{2} S ↓ (b l a c k p r e c i p i t a t e) + H_{2}$

(iv) $[B i I_{4}]^{-} (a q) + H_{2} O (l) D i l u t i o n - ---- \to B i O I_{4} ↓ (w h i t e p r e c i p i t a t e) + H_{2}$
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