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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 |
71%
Level 2: 60%+
Hints
Copper becomes green when exposed to moist air for a long period. This is due to the formation of:
| 1. | A layer of cupric oxide on the surface of copper. |
| 2. | Basic copper sulphate layer on the surface of the metal. |
| 3. | A layer of cupric hydroxide on the surface of copper. |
| 4. | A layer of basic carbonate of copper on the surface of copper. |
Subtopic: Detection of Cations |
Level 3: 35%-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 |
54%
Level 3: 35%-60%
Hints
When \(H_2S\) gas is passed through an ammoniacal salt solution X, a slightly white precipitate is formed.
X can be a:
1. Cobalt salt
2. Lead salt
3. Zinc salt
4. Silver salt
X can be a:
1. Cobalt salt
2. Lead salt
3. Zinc salt
4. Silver salt
Subtopic: Detection of Cations |
52%
Level 3: 35%-60%
Please attempt this question first.
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 |
57%
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
Consider the following reaction:
\(\mathrm{CrCl}_3 \xrightarrow[\mathrm{NH}_4 \mathrm{OH}]{\mathrm{NH}_4 \mathrm{Cl}}(O) \xrightarrow[\text { }]{\mathrm{Na}_2 \mathrm{O}_2~ \mathrm{sol}^{\mathrm{n}}}(\mathrm{~B}) \xrightarrow [\text { aceate }]{\mathrm{lead} \mathrm{}~ \mathrm{}^{\mathrm{}}} (C)\)
In the above reaction sequence, the compound (C) is:
1. \(Na_2CrO_4\)
2. \(Na_2Cr_2O_7\)
3. \(Cr(OH)_3\)
4. \(PbCrO_4\)
\(\mathrm{CrCl}_3 \xrightarrow[\mathrm{NH}_4 \mathrm{OH}]{\mathrm{NH}_4 \mathrm{Cl}}(O) \xrightarrow[\text { }]{\mathrm{Na}_2 \mathrm{O}_2~ \mathrm{sol}^{\mathrm{n}}}(\mathrm{~B}) \xrightarrow [\text { aceate }]{\mathrm{lead} \mathrm{}~ \mathrm{}^{\mathrm{}}} (C)\)
In the above reaction sequence, the compound (C) is:
1. \(Na_2CrO_4\)
2. \(Na_2Cr_2O_7\)
3. \(Cr(OH)_3\)
4. \(PbCrO_4\)
Subtopic: Detection of Cations |
63%
Level 2: 60%+
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
Brown ppt (A) dissolves in \(HNO_3\), gives (B) which in turn gives white ppt (C) with \(NH_4OH\). (C) on reaction with HCl gives solution (D), which gives white turbidity on addition of water. What is (D)?
1. \(Ca(OH)_2\)
2. \(Bi(OH)_3\)
3. BiOCl
4. \(Bi(NO_3)_3\)
1. \(Ca(OH)_2\)
2. \(Bi(OH)_3\)
3. BiOCl
4. \(Bi(NO_3)_3\)
Subtopic: Detection of Cations |
Level 3: 35%-60%
Please attempt this question first.
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
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