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Q. No.\(Cu^{2+}\) ions can be reduced to \(Cu^{+}\) ions by the addition of an aqueous solution of:
1. \(KF \)
2. \(KCl \)
3. \(KI \)
4. \(KOH \)
Subtopic: Detection of Cations | Detection of Anions |
63%
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NEET 2026 - Target Batch - Vital
Hints
Aqueous solution of a salt when treated with \(AgNO_3\) solution gives a white precipitate, which dissolves in \(NH_4OH.\)
The ion present in the salt is:
1. \(Cl^-\)
2. \(NO_3^-\)
3. \(I^-\)
4. All of the above
The ion present in the salt is:
1. \(Cl^-\)
2. \(NO_3^-\)
3. \(I^-\)
4. All of the above
Subtopic: Detection of Anions |
78%
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NEET 2026 - Target Batch - Vital
Hints
On adding \(KI\) solution in excess to a solution of \(CuSO_4\) we get a precipitate 'P and another liquor M. Select the correct pairs:
1. P is \(Cu_2I_2 \) and M is \(I_2\) solution
2. P is \(CuI_2 \) and M is \(I_2\) solution
3. P is \(Cu_2I_2 \) and M is \(KI_3\) solution
4. P is \(CuI_2 \) and M is \(KI_3\) solution
1. P is \(Cu_2I_2 \) and M is \(I_2\) solution
2. P is \(CuI_2 \) and M is \(I_2\) solution
3. P is \(Cu_2I_2 \) and M is \(KI_3\) solution
4. P is \(CuI_2 \) and M is \(KI_3\) solution
Subtopic: Detection of Anions |
54%
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NEET 2026 - Target Batch - Vital
Hints
Which of the following anions gives colourless gas during the preliminary test?
(a) \(SO^{2-}_3\)
(b) \(SO^{2-} _4\)
(c) \(NO^-_2 \)
(d) \(CH_3COO^- \)
1. (a), (b) and (d)
2. (b) and (c)
3. (a), (b) and (c)
4. None of the above
(a) \(SO^{2-}_3\)
(b) \(SO^{2-} _4\)
(c) \(NO^-_2 \)
(d) \(CH_3COO^- \)
1. (a), (b) and (d)
2. (b) and (c)
3. (a), (b) and (c)
4. None of the above
Subtopic: Detection of Anions | Detection of extra elements |
70%
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NEET 2026 - Target Batch - Vital
Hints
\(Fe^{3+},Zn^{2+}\) 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: Detection of Cations |
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NEET 2026 - Target Batch - Vital
Hints
An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When 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: 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 \(NH_4Cl/NH_4OH, \)the volume of precipitate decreases, leaving behind a white gelatinous precipitate. Identify the precipitate that dissolves :
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: Detection of Cations |
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NEET 2026 - Target Batch - Vital
Hints
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.
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 \(KCN\)
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: Detection of Cations |
65%
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NEET 2026 - Target Batch - Vital
Hints
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: Detection of Cations |
73%
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NEET 2026 - Target Batch - Vital
Hints
The incorrect statement among the following about the nitrate ion test is:
| 1. | A dark brown ring is formed at the junction of the two solutions. |
| 2. | Ring is formed due to the formation of nitroso ferrous sulphate complex. |
| 3. | The brown complex is \([Fe(H_2O)_5~(NO)]SO_4.\) |
| 4. | Upon heating the nitrate salt with conc. \(H_2SO_4,\), light brown fumes are evolved. |
Subtopic: Detection of Anions |
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
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