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Q. No.Which of the following salts are black ?
(a) \(PbS\)
(b) \(CuS\)
(c) \(B i _2 S_3 \)
(d) \(HgS\)
1. (a), (b), (c)
2. (b) and (c)
3. (a), (b), (d)
4. None of the above
Subtopic: Detection of Cations |
71%
Level 2: 60%+
Hints
Which of the following are orange in colour?
(a) \(Sb_2S_3\)
(b) \(PbS\)
(c) \(Sb_2S_5\)
(d) All of the above.
1. (a), (b), (d)
2. (a) and (c)
3. (a), (b), (d)
4. None of these
(a) \(Sb_2S_3\)
(b) \(PbS\)
(c) \(Sb_2S_5\)
(d) All of the above.
1. (a), (b), (d)
2. (a) and (c)
3. (a), (b), (d)
4. None of these
Subtopic: Detection of Cations | Detection of Anions |
77%
Level 2: 60%+
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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 |
69%
Level 2: 60%+
Hints
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: 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%
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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
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