Question

Match List-I with the List-IIList-I
(Precipitating reagent and
conditions)| List-II
(Cation)
---|---
(A) $NH_4Cl + NH_4OH$| (I) Mn2+
(B) $NH_4OH + Na_2CO_3$| (II) Pb2+
(C) $NH_4OH + NH_4Cl + H_2S gas$| (III) Al3+
(D) dilute HCl| (IV) Sr2+
Choose the correct answer from the options given below:

• A. A-IV, B-III, C-II, D-I
• B. A-IV, B-III, C-I, D-II
• C. A-III, B-IV, C-I, D-II
• D. A-III, B-IV, C-II, D-I

Answer 1

Answer: (C)

A-III, B-IV, C-I, D-II

Answer 2

The matching is based on the chemical properties and specific precipitation conditions for cations:
[A.] NH$_4$Cl + NH$_4$OH precipitates Al(OH)$_3$, hence matches with III. Al$^{3+}$.
[B.] NH$_4$OH + Na$_2$CO$_3$ precipitates SrCO$_3$, hence matches with IV. Sr$^{2+}$.
[C.] NH$_4$OH + NH$_4$Cl + H$_2$S gas precipitates PbS, hence matches with II. Pb$^{2+}$.
[D.] Dilute HCl precipitates MnCl$_2$, hence matches with I. Mn$^{2+}$.
Thus, the correct order is:
$A -- III, B -- IV, C -- II, D -- I.$