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Q. No.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%
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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. \(CO_2\)
1. \(H_2\)
2. \(SO_2\)
3. \(H_2S\)
4. \(CO_2\)
Subtopic: Detection of Anions |
90%
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Which ion is indicated by the presence of hydrogen sulfide gas?
1. \(SO^{2-}_4\)
2. \(S^{2-}\)
3. \(Cl^-\)
4. \(H^+\)
1. \(SO^{2-}_4\)
2. \(S^{2-}\)
3. \(Cl^-\)
4. \(H^+\)
Subtopic: Detection of Anions |
93%
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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
1. It turns white
2. It remains unchanged
3. It turns black
4. It turns yellow
Subtopic: Detection of Anions |
92%
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B in the following reaction is :
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+B+\mathrm{H}_2 \mathrm{O} .}\)
1. SO42-
2. OH-
3. \(SO_3^{-2}\)
4. None of the above
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+B+\mathrm{H}_2 \mathrm{O} .}\)
1. SO42-
2. OH-
3. \(SO_3^{-2}\)
4. None of the above
Subtopic: Detection of Anions |
80%
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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
1. Red to green
2. Green to red
3. Orange to green
4. Yellow to green
Subtopic: Detection of Anions |
79%
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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 |
86%
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\(\begin{aligned} & \mathrm{Na}_2 \mathrm{~S}+\mathrm{Na}_2\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right] \longrightarrow \text A \\ & \text { Sodium nitroprusside } \\ & \end{aligned} \)
The formula of A is :
1. \(Na_4[Fe(CN)_5NOS]\)
2. \(Na_2[Fe(CN)_5NOS]\)
3. \(K_4[Fe(CN)_5NOS]\)
4. \(K_2 [Fe(CN)_4NOS]\)
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 |
83%
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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. \( \mathrm{PO}_4{ }^{3-}\)
1. \(\mathrm{Cl}^{-}\)
2. \(\mathrm{CO}_3{ }^{2-}\)
3. \( \mathrm{OH}^{-} \)
4. \( \mathrm{PO}_4{ }^{3-}\)
Subtopic: Detection of Anions |
75%
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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. \(\mathrm { Dilute } ~\mathrm{NH}_{ 4} \mathrm{OH}\)
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 |
87%
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