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JEE Advanced 2025Paper 1
Exam
JEE Advanced
Year
2025
Paper
Paper 1
Subject
Chemistry
Chapter
Practical Chemistry

JEE Advanced 2025 · Paper 1 · Chemistry · Practical Chemistry

The correct match of the group reagents in List-I for precipitating...

The correct match of the group reagents in List-I for precipitating the metal ion given in List-II from solutions, is
LIST - I LIST - II
(P) Passing H2 S\mathrm{H}_2 \mathrm{~S} in the presence of NH4OH\mathrm{NH}_4 \mathrm{OH} (1) Cu2+\mathrm{Cu}^{2+}
(Q) \left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3inthepresenceofin the presence of\mathrm{NH}_4 \mathrm{OH}</td><td>(2)</td><td></td> <td>(2) </td> <td>\mathrm{Al}^{3+}</td></tr><tr><td>(R)</td><td></td> </tr> <tr> <td>(R) </td> <td>\mathrm{NH}_4 \mathrm{OH}inthepresenceofin the presence of\mathrm{NH}_4 \mathrm{Cl}</td><td>(3)</td><td></td> <td>(3) </td> <td>\mathrm{Mn}^{2+}</td></tr><tr><td>(S)</td><td>Passing</td> </tr> <tr> <td>(S) </td> <td>Passing\mathrm{H}_2 \mathrm{~S}inthepresenceofdiluteHCl</td><td>(4)</td><td>in the presence of dilute HCl </td> <td>(4) </td> <td>\mathrm{Ba}^{2+}</td></tr><tr><td></td><td></td><td>(5)</td><td></td> </tr> <tr> <td> </td> <td> </td> <td>(5) </td> <td>\mathrm{Mg}^{2+}$

Options

  1. AP→3;Q→4;R→2;S→1\mathrm{P} \rightarrow 3 ; \mathrm{Q} \rightarrow 4 ; \mathrm{R} \rightarrow 2 ; \mathrm{S} \rightarrow 1
  2. BP→4;Q→2;R→3;S→1\mathrm{P} \rightarrow 4 ; \mathrm{Q} \rightarrow 2 ; \mathrm{R} \rightarrow 3 ; \mathrm{S} \rightarrow 1
  3. CP→3;Q→4;R→1;S→5\mathrm{P} \rightarrow 3 ; \mathrm{Q} \rightarrow 4 ; \mathrm{R} \rightarrow 1 ; \mathrm{S} \rightarrow 5
  4. DP→5;Q→3;R→2;S→4\mathrm{P} \rightarrow 5 ; \mathrm{Q} \rightarrow 3 ; \mathrm{R} \rightarrow 2 ; \mathrm{S} \rightarrow 4

Correct answer

A. P→3;Q→4;R→2;S→1\mathrm{P} \rightarrow 3 ; \mathrm{Q} \rightarrow 4 ; \mathrm{R} \rightarrow 2 ; \mathrm{S} \rightarrow 1

Step-by-step solution

Mn+2→H2 S+NH4OHMnS↓ Pink/buff ppt. Ba+2→(NH4)2CO3+NH4OHBaCO3↓ White ppt. Al+3→NH4Cl+NH4OHAl(OH)3↓ White ppt. Cu+2→H2 S+HCl (dil.) CuS↓ Black ppt. \mathrm{Mn}^{+2} \xrightarrow{\mathrm{H}_2 \mathrm{~S}+\mathrm{NH}_4 \mathrm{OH}} \underset{\text{ Pink/buff ppt. }}{\mathrm{MnS} \downarrow} \mathrm{Ba}^{+2} \xrightarrow{\left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3+\mathrm{NH}_4 \mathrm{OH}} \underset{\text{ White ppt. }}{\mathrm{BaCO}_3 \downarrow} \mathrm{Al}^{+3} \xrightarrow{\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}} \underset{\text{ White ppt. }}{\mathrm{Al}(\mathrm{OH})_3 \downarrow} \mathrm{Cu}^{+2} \xrightarrow{\mathrm{H}_2 \mathrm{~S}+\mathrm{HCl} \text{ (dil.) }} \underset{\text{ Black ppt. }}{\mathrm{CuS} \downarrow}
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