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Q. No.Which colourless gas evolves with a characteristic smell of rotten eggs?
1.
\(H_2\)
2.
\(SO_2\)
3.
\(H_2S\)
4.
\(CO_2\)
Subtopic: Detection of Anions |
91%
Level 1: 80%+
Hints
Which ion is indicated by the presence of hydrogen sulfide gas?
| 1. | \(SO^{2-}_4\) | 2. | \(S^{2-}\) |
| 3. | \(Cl^-\) | 4. | \(H^+\) |
Subtopic: Detection of Anions |
92%
Level 1: 80%+
Hints
What happens to lead acetate paper when exposed to H2S gas?
| 1. | It turns white | 2. | It remains unchanged |
| 3. | It turns black | 4. | It turns yellow |
Subtopic: Detection of Anions |
89%
Level 1: 80%+
Hints
Identify B in the following reaction:
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+\mathrm B+\mathrm{H}_2 \mathrm{O}}\)
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+\mathrm B+\mathrm{H}_2 \mathrm{O}}\)
| 1. | \(SO_4^{2-}\) | 2. | \(OH^-\) |
| 3. | \(\mathrm S\mathrm O_3^{-2}\) | 4. | None of the above |
Subtopic: Detection of Anions |
76%
Level 2: 60%+
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What is the color change observed when sulphur dioxide reacts with acidified potassium dichromate solution?
| 1. | Red to green | 2. | Green to red |
| 3. | Orange to green | 4. | Yellow to green |
Subtopic: Detection of Anions |
77%
Level 2: 60%+
Hints
Which of the following gases has a pungent smell similar to burning sulphur?
| 1. | Oxygen | 2. | Nitrogen |
| 3. | Carbon dioxide | 4. | Sulphur dioxide |
Subtopic: Detection of Anions |
86%
Level 1: 80%+
Hints
The colour of Chromium sulphate in the following reaction is:
\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{SO}_4+3 \mathrm{SO}_2 \longrightarrow \mathrm{K}_2 \mathrm{SO}_4+\underset{\substack{\text { Chromium } \\ \text { sulphate }}}{\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3}\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+\mathrm{H}_2 \mathrm{O}\)
1. Green
2. Blue
3. White
4. Pink
\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{SO}_4+3 \mathrm{SO}_2 \longrightarrow \mathrm{K}_2 \mathrm{SO}_4+\underset{\substack{\text { Chromium } \\ \text { sulphate }}}{\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3}\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+\mathrm{H}_2 \mathrm{O}\)
1. Green
2. Blue
3. White
4. Pink
Subtopic: Detection of Anions |
82%
Level 1: 80%+
Hints
\(\begin{aligned} & \mathrm{Na}_2 \mathrm{~S}+\mathrm{Na}_2\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right] \longrightarrow \text A \\ & \text { Sodium nitroprusside } \\ & \end{aligned} \)
The formula of A is:
The formula of A is:
| 1. | \(Na_4[Fe(CN)_5NOS]\) | 2. | \(Na_2[Fe(CN)_5NOS]\) |
| 3. | \(K_4[Fe(CN)_5NOS]\) | 4. | \(K_2 [Fe(CN)_4NOS]\) |
Subtopic: Detection of Anions |
81%
Level 1: 80%+
Hints
Which of the following anions can be detected using dilute \(\mathrm{H}_ 2 \mathrm{SO}_ 4\)?
| 1. | \(\mathrm{Cl}^{-}\) | 2. | \(\mathrm{CO}_3{ }^{2-}\) |
| 3. | \( \mathrm{OH}^{-} \) | 4. | \( \mathrm{PO}_4{ }^{3-}\) |
Subtopic: Detection of Anions |
76%
Level 2: 60%+
Hints
Which group reagent is used for the precipitation of group II basic radicals in qualitative analysis?
| 1. | \(\mathrm { Dilute } ~\mathrm{HCl}\) | 2. | \(\mathrm{Dilute }~ \mathrm{HCl}+\mathrm{H} _2 \mathrm{S} \) |
| 3. | \( \mathrm{Dilute~ H_{2}SO_{4} }\) | 4. | \(\mathrm { Dilute } ~\mathrm{NH}_{ 4} \mathrm{OH}\) |
Subtopic: Detection of Cations |
85%
Level 1: 80%+
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