Q. No.\(\mathrm{NH}_4 \mathrm{SCN} \) can be used to test:
1. \(\mathrm{Fe}^{3+} \)
2. \(\mathrm{Co}^{2+}, \mathrm{Cu}^{2+}\)
3. \(\mathrm{Fe}^{3+}, \mathrm{Cu}^{2+}\)
4. All of the above
Subtopic: Â Detection of Cations |
 53%
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NEET 2026 - Target Batch - Vital
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When bismuth chloride is poured into a large volume of water, the formula for the white precipitate produced is:
1. \(Bi(OH)_3\)
2. \(Bi_2O_3 \)
3. \(BiOCl \)
4. \(Bi_2OCl \)
1. \(Bi(OH)_3\)
2. \(Bi_2O_3 \)
3. \(BiOCl \)
4. \(Bi_2OCl \)
Subtopic: Â Detection of Cations |
From NCERT
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\(Cu^{2+}\) ions can be reduced to \(Cu^{+}\) ions by the addition of an aqueous solution of:
1. \(KF \)
2. \(KCl \)
3. \(KI \)
4. \(KOH \)
1. \(KF \)
2. \(KCl \)
3. \(KI \)
4. \(KOH \)
Subtopic: Â Detection of Cations |Â Detection of Anions |
 63%
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\(Fe^{3+},Zn^{2+}\) and \(Cu^{2+}.\) cations are present in a slightly acidic solution. The reagent that when added in excess to this solution would identify to separate \(Fe^{3+}\) in one step is:
1. \(2M~HCl \)
2. \(6M~NH_3 \)
3. \(6M~NaOH \)
4. \(H_2S~\) gas
1. \(2M~HCl \)
2. \(6M~NH_3 \)
3. \(6M~NaOH \)
4. \(H_2S~\) gas
Subtopic: Â Detection of Cations |
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An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating.cWhen hydrogen sulfide is passed through the hot acidic solution, a black precipitate is obtained.
The substance is a:
1. \(Hg^{2+}_2\) salt
2. \(Cu^{2+}\) salt
3. \(Ag^+\) salt
4. \(Pb^{2+}\) salt
The substance is a:
1. \(Hg^{2+}_2\) salt
2. \(Cu^{2+}\) salt
3. \(Ag^+\) salt
4. \(Pb^{2+}\) salt
Subtopic: Â Detection of Cations |
 74%
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NEET 2026 - Target Batch - Vital
Hints
A solution when diluted with \(H_2O\) and boiled, gives a white precipitate. Upon addition of excess \(NH_2Cl/NH_4OH, \) the volume of precipitate decreases, leaving behind a white gelatinous precipitate. Identify the precipitate that dissolves in \(NH_4OH/NH_4Cl\)
1. \(Al(OH)_3\)
2. \(Z n(OH)_2\)
3. \(Ca(OH)_2\)
4. \(Mg(OH)_2\)
1. \(Al(OH)_3\)
2. \(Z n(OH)_2\)
3. \(Ca(OH)_2\)
4. \(Mg(OH)_2\)
Subtopic: Â Detection of Cations |
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An aqueous solution of metal ion M1 reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M2 always forms tetrahedral complexes with these reagents. Aqueous solution of M2 on reaction with reagent S gives a white precipitate which dissolves
in excess of S. The reactions are summarized in the scheme given below.
M1, Q, and R, respectively, are:
1. \(Zn^{2+}, ~ KCN\) and \(HCl\)
2. \(Ni^{2+},~ HCl\) and \(KCN\)
3. \(Cd^{2+}, ~KCN\) and \(HCl\)
4. \(Co^{2+},~ HCl\) and \(KCN\)
in excess of S. The reactions are summarized in the scheme given below.
M1, Q, and R, respectively, are:
1. \(Zn^{2+}, ~ KCN\) and \(HCl\)
2. \(Ni^{2+},~ HCl\) and \(KCN\)
3. \(Cd^{2+}, ~KCN\) and \(HCl\)
4. \(Co^{2+},~ HCl\) and \(KCN\)
Subtopic: Â Detection of Cations |
 65%
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During the qualitative analysis of salt with cation \(y^{2+ },\) addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation \((y^{2+})\) respectively, are:
1. Dimethylglyoxime and \(Ni^{2+}\)
2. Dimethylglyoxime and \(Co^{2+}\)
3. Nessler's reagent and \(Hg^{2+}\)
4. Nessler's reagent and \(Ni^{2+}\)
1. Dimethylglyoxime and \(Ni^{2+}\)
2. Dimethylglyoxime and \(Co^{2+}\)
3. Nessler's reagent and \(Hg^{2+}\)
4. Nessler's reagent and \(Ni^{2+}\)
Subtopic: Â Detection of Cations |
 73%
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Which of the following cations precipitate as their chlorides?
(a) \(Pb^{2+}\)
(b) \(Ag^{+}\)
(c) \(Hg^{2+}_2\)
(d) \(Cd^{2+}\)
1. (a), (b), (d)
2. (b) and (c)
3. (a), (b), (c)
4. None of the above
(a) \(Pb^{2+}\)
(b) \(Ag^{+}\)
(c) \(Hg^{2+}_2\)
(d) \(Cd^{2+}\)
1. (a), (b), (d)
2. (b) and (c)
3. (a), (b), (c)
4. None of the above
Subtopic: Â Detection of Cations |
 75%
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Nessler's reagent is used to detect:
1. \(CrO^{2-}_4\)
2. \(PO^{3-}_4\)
3. \(MnO^{-}_4\)
4. \(NH^{+}_4\)
1. \(CrO^{2-}_4\)
2. \(PO^{3-}_4\)
3. \(MnO^{-}_4\)
4. \(NH^{+}_4\)
Subtopic: Â Detection of Cations |
 78%
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NEET 2026 - Target Batch - Vital
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