Match the reaction listed in column (I) with the colour of the precipitate(s) listed in column (II) :
List - I
List - II
(A)
(P) Brown
(B) $Pb^{2 +} + CrO_{4}^{2 -} \to$
(Q) Reddish brown ppt.
(C) $CO_{3}^{2 -} + 4 Hg^{2 +} + 3 H_{2} O \to$
(R) Yellow
(D) $Mn_{(aq) .}^{2 +} + 2 OH_{(aq) .}^{-} \to$
(S) White

Question

Match the reaction listed in column (I) with the colour of the precipitate(s) listed in column (II) :

List - I	List - II
(A)	(P) Brown
(B) $Pb^{2 +} + CrO_{4}^{2 -} \to$	(Q) Reddish brown ppt.
(C) $CO_{3}^{2 -} + 4 Hg^{2 +} + 3 H_{2} O \to$	(R) Yellow
(D) $Mn_{(aq) .}^{2 +} + 2 OH_{(aq) .}^{-} \to$	(S) White

TestHub · Accepted Answer

Question Explanation :

Match reactions with precipitate colors.

Concept:

Qualitative analysis of inorganic salts.

Solution:

The colors of precipitates in inorganic qualitative analysis are characteristic of the compounds formed

$Cu^{+ 2} + SCN^{-} sometime (white) Cu (CN) ↓ Pb^{+ 2} + CrO_{4}^{2 -} ⟶ (yellow) PbCrO_{4} ↓ CO_{3}^{2 -} + 4 Hg^{+ 2} + 3 H_{2} O ⟶ basic HgCO_{3} Red brown ppt of Mn^{+ 2} + 2 \overline{O} H air (brown) MnO (OH)_{2} ↓$

Final Answer: $(A) \to (S); (B) \to (R); (C) \to (Q); (D) \to (S)$

Chemistry - Salt Analysis Question with Solution | TestHub

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