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Q. No.
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
Salt (A) on heating gives a colourless neutral gas that supports combustion. It can be concluded, based on the diagram given above that the correct statement(s) among the following is/are:
1. Salt (A) gives a yellow precipitate with chloroplatinic acid as well as with sodium cobaltinitrite.
2. The brown ring is formed due to the formation of nitroso ferrous sulphate \([\mathrm{Fe}(\mathrm{NO})]^{2+} \mathrm{SO}_4^{-}\)
3. Salt ‘C’ reacts with silver nitrate solution to form a white precipitate.
4. (A) and (B) both.
Subtopic: Detection of Anions |
63%
Level 2: 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
Subtopic: Detection of Anions |
86%
Level 1: 80%+
Hints
A substance on treatment with dil. \(H_2SO_4\) liberates a colourless gas that produces
(i) turbidity with baryta water
(ii) turns acidified dichromate solution green
The reaction indicates the presence of:
1. \(CO^{2-}_3\)
2. \(S^{2-}\)
3. \(SO^{2-}_3\)
4. \(NO^{-}_2\)
(i) turbidity with baryta water
(ii) turns acidified dichromate solution green
The reaction indicates the presence of:
1. \(CO^{2-}_3\)
2. \(S^{2-}\)
3. \(SO^{2-}_3\)
4. \(NO^{-}_2\)
Subtopic: Detection of Anions |
51%
Level 3: 35%-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
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
Sodium nitroprusside gives a violet colour in an alkaline solution with:
1. \(S^{2-}\)
2. \(SO^{2-}_3\)
3. \(SO^{2-}_4\)
4. \(NO^{-}_2\)
1. \(S^{2-}\)
2. \(SO^{2-}_3\)
3. \(SO^{2-}_4\)
4. \(NO^{-}_2\)
Subtopic: Detection of Anions |
59%
Level 3: 35%-60%
Hints
The brown ring test for NO3- is enabled due to the formation of the complex ion with the formula:
1. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \)
2. \(\mathrm{Fe}\left[\mathrm{NO}(\mathrm{CN})_5\right]^{2-} \)
3. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+} \)
4. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)(\mathrm{NO})_5\right]^{2+} \)
1. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \)
2. \(\mathrm{Fe}\left[\mathrm{NO}(\mathrm{CN})_5\right]^{2-} \)
3. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+} \)
4. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)(\mathrm{NO})_5\right]^{2+} \)
Subtopic: Detection of Anions |
82%
Level 1: 80%+
Hints
Which of the following combines with \(Fe ~(II) \) ions to form a brown complex?
1. \(N_2O \)
2. \(NO \)
3. \(N_2O_3 \)
4. \(N_2O_5 \)
1. \(N_2O \)
2. \(NO \)
3. \(N_2O_3 \)
4. \(N_2O_5 \)
Subtopic: Detection of Anions | Detection of extra elements |
79%
Level 2: 60%+
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