Q. No.Which element's presence is detected through Beilstein test?
1. Sulfur (\(S\))
2. Chlorine (\(Cl\))
3. Carbon (\(C\)) and Hydrogen (\(H\))
4. Nitrogen (\(N\))
1. Sulfur (\(S\))
2. Chlorine (\(Cl\))
3. Carbon (\(C\)) and Hydrogen (\(H\))
4. Nitrogen (\(N\))
Subtopic: Detection of Anions |
73%
Level 2: 60%+
Hints
Pink colour of acidified \(KMnO_4\) is decolourised but there is no evolution of any gas. This may happen with the compound containing the following acid radical (s):
| 1. | \(SO^{2-}_3\) | 2. | \(NO^{-}_2\) |
| 3. | \(S^{2-}\) | 4. | All of the above |
Subtopic: Detection of Anions |
55%
Level 3: 35%-60%
Hints
Salt (A), when heated, releases a colorless neutral gas that supports combustion. Based on the diagram provided, it can be concluded that compound (A) contains the following acid radical:
| 1. | \(\mathrm{NO}_2^{-} \) | 2. | \(\mathrm{NO}_3^{-} \) |
| 3. | \(\mathrm{Br}^ - \) | 4. | \(\mathrm{SO}_3{ }^{2-}\) |
Subtopic: Detection of Anions |
58%
Level 3: 35%-60%
Hints
Which of the following gives foul-smelling gas with the smell of rotten eggs with dil. \(H_2SO_4\)?
1. \(CO^{2-}_3\)
2. \(SO^{2-}_3\)
3. \(S^{2-}\)
4. \(NO^-_2\)
1. \(CO^{2-}_3\)
2. \(SO^{2-}_3\)
3. \(S^{2-}\)
4. \(NO^-_2\)
Subtopic: Detection of Anions |
83%
Level 1: 80%+
Hints
A reagent that can separate a mixture of AgCl and AgI is:
1. KCN
2. \(Na_2S_2O_3 \)
3. \(dil HNO_3 \)
4. \(NH_3 \)
1. KCN
2. \(Na_2S_2O_3 \)
3. \(dil HNO_3 \)
4. \(NH_3 \)
Subtopic: Detection of Anions |
Level 3: 35%-60%
Hints
What is the product when NaBr and concentrated H2SO4 are heated together?
| 1. | HOBr | 2. | HBr |
| 3. | \(Br_2\) | 4. | \(HBrO_3\) |
Subtopic: Detection of Anions |
Level 3: 35%-60%
Hints
A gas (X) is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with the evolution of a colourless gas (Y). X and Y, respectively, are:
1. \(X= CO_2,~Y=Cl_2 \)
2. \(X= Cl_2,~Y=CO_2 \)
3. \(X= Cl_2,~Y=H \)
4. \(X= H,~Y=Cl_2 \)
1. \(X= CO_2,~Y=Cl_2 \)
2. \(X= Cl_2,~Y=CO_2 \)
3. \(X= Cl_2,~Y=H \)
4. \(X= H,~Y=Cl_2 \)
Subtopic: Detection of Anions |
Level 3: 35%-60%
Hints
\(Cu^{2+}\) 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: Detection of Cations | Detection of Anions |
65%
Level 2: 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
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%
Level 2: 60%+
Hints
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