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Q. No.Which compound is responsible for the green flame in the Borate ion test?
1. \(\left(\mathrm{CH}_3\right)_3 \mathrm{BO}_3\)
2. \(\left(C_2 \mathrm{H}_5\right)_3 \mathrm{BO}_3\)
3. \(\mathrm{H}_3 \mathrm{BO}_3\)
4. \(\mathrm{(C_2 H_5)_3 \mathrm{BO}_4}\)
Subtopic: Detection of Anions |
54%
Level 3: 35%-60%
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Which gas, characterized by brisk effervescence, causes lime water to turn milky?
| 1. | Nitrogen | 2. | Oxygen |
| 3. | Carbon dioxide | 4. | Hydrogen |
Subtopic: Detection of Anions |
95%
Level 1: 80%+
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The colourless gas that evolved with the smell of rotten eggs is:
| 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 |
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%+
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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 |
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 |
84%
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
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