Question

Match the List-I with List-II :

• A. $P \rightarrow$ iv, $Q \rightarrow$ ii, $R \rightarrow$ ii., $S \rightarrow i$
• B. $P \rightarrow i , Q \rightarrow iii , R \rightarrow$ ii, $S \rightarrow$ iv
• C. $P \rightarrow$ iii, $Q \rightarrow$ i, $R \rightarrow$ iv, $S \rightarrow$ ii
• D. $P \rightarrow$ i. $Q \rightarrow$ iii, $R \rightarrow$ iv, $S \rightarrow$ ii

Answer 1

The Correct Option is D

- P (Pb$^{2+}$, Cu$^{2+}$): Group I cations are precipitated as sulfides in the presence of H$_2$S and dilute HCl.
- Q (Al$^{3+}$, Fe$^{3+}$): Group III cations form hydroxides in the presence of NH$_4$Cl and NH$_4$OH.
- R (Co$^{2+}$, Ni$^{2+}$): Group IV cations form sulfides in the presence of H$_2$S and NH$_4$OH.
- S (Ba$^{2+}$, Ca$^{2+}$): Group V cations form carbonates with (NH$_4$)$_2$CO$_3$ in the presence of NH$_4$OH.
Qualitative analysis involves group-wise separation of cations based on selective precipitation using reagents like H$_2$S, NH$_4$OH, and (NH$_4$)$_2$CO$_3$.