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Q. No.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
Subtopic: Detection of Cations |
73%
Level 2: 60%+
Hints
Potassium chromate solution is added to an aqueous solution of a metal nitrate. The yellow precipitate thus obtained is insoluble in acetic acid. These are subjected to flame test, the flame colour of individual ppt. is/are:
(a) Lilac
(b) Apple green
(c) Crimson red
(d) Blue
1. (a), (b), (d)
2. (b) and (d)
3. (a), (b), (c)
4. None of the above
(a) Lilac
(b) Apple green
(c) Crimson red
(d) Blue
1. (a), (b), (d)
2. (b) and (d)
3. (a), (b), (c)
4. None of the above
Subtopic: Detection of Cations |
57%
Level 3: 35%-60%
Please attempt this question first.
Hints
A white sublimable solid, when boiled with an \(NaOH\) solution, gives a colourless gas that turns Nessler's reagent brown. The solid, on being heated with solid \(K_2Cr_2O_7\) and concentrated \(H_2SO_4,\) gives red brown vapours. The white solid can be :
(a) \(NH_4I\)
(b) \(NH_4Br\)
(c) \(NH_4Cl\)
(d) \((NH_4)_2SO_4\)
1. (a), (b), (d)
2. (b) and (c)
3. (a), (b), (c)
4. None of the above
(a) \(NH_4I\)
(b) \(NH_4Br\)
(c) \(NH_4Cl\)
(d) \((NH_4)_2SO_4\)
1. (a), (b), (d)
2. (b) and (c)
3. (a), (b), (c)
4. None of the above
Subtopic: Detection of Cations |
53%
Level 3: 35%-60%
Hints
The cation which gives yellow ppt with \(K_2CrO_4 \) in acetic acid is:
(a) \(Ba^{2+}\)
(b) \(Pb^{2+}\)
(c) \(Ca^{2+}\)
(d) \(Al^{3+}\)
1. (a) and (b)
2. (b) and (c)
3. (a), (b) and (c)
4. (a), (b), (c) and (d)
(a) \(Ba^{2+}\)
(b) \(Pb^{2+}\)
(c) \(Ca^{2+}\)
(d) \(Al^{3+}\)
1. (a) and (b)
2. (b) and (c)
3. (a), (b) and (c)
4. (a), (b), (c) and (d)
Subtopic: Detection of Cations |
Level 3: 35%-60%
Hints
A white precipitate is obtained when
(a) A solution of \(BaCl_2 \) is treated with \(Na_2SO_3 \)
(b) A solution of \(NaAlO_2 \) is heated with \(NH_4Cl \)
(c) \(H_2S \) is passed through a solution of \(ZnSO_4\)
(d) A solution of \(ZnSO_4 \) is treated with one of \(Na_2CO_3 \)
1. (a), (b), (d)
2. (b) and (c)
3. (a), (b), (c)
4. (a), (b), (c) and (d)
(a) A solution of \(BaCl_2 \) is treated with \(Na_2SO_3 \)
(b) A solution of \(NaAlO_2 \) is heated with \(NH_4Cl \)
(c) \(H_2S \) is passed through a solution of \(ZnSO_4\)
(d) A solution of \(ZnSO_4 \) is treated with one of \(Na_2CO_3 \)
1. (a), (b), (d)
2. (b) and (c)
3. (a), (b), (c)
4. (a), (b), (c) and (d)
Subtopic: Detection of Cations |
50%
Level 3: 35%-60%
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Hints
On reaction with dilute \(H_2SO_4,\) which of the following salts will give out a gas that turns an acidified dichromate paper green?
(a) \(Na_2CO_3\)
(b) \(Na_2S\)
(c) \(ZnSO_3\)
(d) \(FeS\)
1. (b), (c), (d)
2. (b) and (c)
3. (a), (b), (c)
4. None of the above
(a) \(Na_2CO_3\)
(b) \(Na_2S\)
(c) \(ZnSO_3\)
(d) \(FeS\)
1. (b), (c), (d)
2. (b) and (c)
3. (a), (b), (c)
4. None of the above
Subtopic: Detection of Cations |
63%
Level 2: 60%+
Hints
A pair of ions that can be separated by using \(NH_4Cl \) and \(NH_4OH \) are:
(a) \(Fe^{3+}\) and \(Cr^{3+}\)
(b) \(Cr^{3+}\) and \(Co^{2+}\)
(c) \(Cr^{3+}\) and \(Al^{3+}\)
(d) \(Al^{3+}\) and \(Ba^{2+}\)
1. (a), (b), (d)
2. (b) and (d)
3. (a), (b), (c)
4. None of the above
(a) \(Fe^{3+}\) and \(Cr^{3+}\)
(b) \(Cr^{3+}\) and \(Co^{2+}\)
(c) \(Cr^{3+}\) and \(Al^{3+}\)
(d) \(Al^{3+}\) and \(Ba^{2+}\)
1. (a), (b), (d)
2. (b) and (d)
3. (a), (b), (c)
4. None of the above
Subtopic: Detection of Cations |
54%
Level 3: 35%-60%
Please attempt this question first.
Hints
Which of the following cations cannot be separated by passing \(H_2S\) through their solutions to which \(NH_4OH\) has been added?
(a) \(Ca^{2+}\) and \(Ni^{2+}\)
(b) \(Mg^{2+}\) and \(Mn^{2+}~\)
(c) \(Ni^{2+}\) and \(Mn^{2+}\)
(d) \(Co^{2+}\) and \(Zn^{2+}\)
1. (a), (b), (d)
2. (c) and (d)
3. (a), (b), (c)
4. (b) Only
(a) \(Ca^{2+}\) and \(Ni^{2+}\)
(b) \(Mg^{2+}\) and \(Mn^{2+}~\)
(c) \(Ni^{2+}\) and \(Mn^{2+}\)
(d) \(Co^{2+}\) and \(Zn^{2+}\)
1. (a), (b), (d)
2. (c) and (d)
3. (a), (b), (c)
4. (b) Only
Subtopic: Detection of Cations |
63%
Level 2: 60%+
Hints
Incorrect statements among the following are:
1. (a), (b) and (d)
2. (c) and (d)
3. (a), (b) and (c)
4. (a), (b), (c) and (d)
| (a) | Group I radicals are precipitated as chloride |
| (b) | Group IV radicals are precipitated as sulphide |
| (c) | Group V radicals are precipitated as hydroxide |
| (d) | Group III radicals are precipitated as chloride |
2. (c) and (d)
3. (a), (b) and (c)
4. (a), (b), (c) and (d)
Subtopic: Detection of Cations |
62%
Level 2: 60%+
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 |
Level 3: 35%-60%
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