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Q. No.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%+
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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 |
91%
Level 1: 80%+
Hints
B in the following reaction is:
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+B+\mathrm{H}_2 \mathrm{O} .}\)
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+B+\mathrm{H}_2 \mathrm{O} .}\)
| 1. | SO42- | 2. | OH- |
| 3. | \(SO_3^{-2}\) | 4. | None of the above |
Subtopic: Detection of Anions |
77%
Level 2: 60%+
Hints
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 |
79%
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 |
85%
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 |
83%
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 |
80%
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 |
77%
Level 2: 60%+
Hints
What is the group reagent 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%+
Hints
What is the purpose of using Mohr's salt in titration experiments?
1. To standardize the solution
2. To act as an indicator
3. To determine the volume of the analyte
4. To adjust the pH of the solution
1. To standardize the solution
2. To act as an indicator
3. To determine the volume of the analyte
4. To adjust the pH of the solution
Subtopic: The chemistry involved in the titrimetric exercises |
Level 3: 35%-60%
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