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Q. No.Ammonium dichromate is used in some fireworks. The green-coloured powder blown in the air is due to:
1. \(CrO_3 \)
2. \(Cr_2O_3 \)
3. \(Cr\)
4. \(CrO(O_2) \)
Subtopic: Detection of Cations |
76%
Level 2: 60%+
Hints
A white precipitate obtained in the analysis of a mixture becomes black on treatment with \(\mathrm{NH_4OH}.\) It may be:
| 1. | \(\mathrm{PbCl_2}\) | 2. | \(\mathrm{AgCl}\) |
| 3. | \(\mathrm{HgCl_2}\) | 4. | \(\mathrm{Hg_2Cl_2}\) |
Subtopic: Detection of Cations |
Level 3: 35%-60%
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 |
55%
Level 3: 35%-60%
Hints
Consider the following sequence of tests:
\(M^{n+} ~+ HCl \rightarrow \) White precipitate \(\xrightarrow \Delta \) water soluble
The metal ion \((M^{n+})\)) can be:
1. \(Hg^{2+}\)
2. \(Ag^{+}\)
3. \(Pb^{2+}\)
4. \(Sn^{2+}\)
\(M^{n+} ~+ HCl \rightarrow \) White precipitate \(\xrightarrow \Delta \) water soluble
The metal ion \((M^{n+})\)) can be:
1. \(Hg^{2+}\)
2. \(Ag^{+}\)
3. \(Pb^{2+}\)
4. \(Sn^{2+}\)
Subtopic: Detection of Cations |
51%
Level 3: 35%-60%
Hints
Which of the following compounds does magnesium precipitate when you test for it ?
1. \(MgCO_3.MgO \)2. \(MgCO_3\)
3. \(Mg(OH)_2 \)
4. \(MgNH_4PO_4.6H_2O \)
Subtopic: Detection of Cations |
69%
Level 2: 60%+
Hints
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
(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 |
73%
Level 2: 60%+
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 |
71%
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 |
75%
Level 2: 60%+
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
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