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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 |
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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Which indicator is commonly used in the titration of Mohr's salt with potassium permanganate?
1. Phenolphthalein
2. Methyl orange
3. Starch
4. None of the above
1. Phenolphthalein
2. Methyl orange
3. Starch
4. None of the above
Subtopic: The chemistry involved in the titrimetric exercises |
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In the titration of oxalic acid with \(\mathrm{KMnO_4}\), what is the role of oxalic acid?
1. Oxidizing agent
2. Reducing agent
3. Indicator
4. Catalyst
1. Oxidizing agent
2. Reducing agent
3. Indicator
4. Catalyst
Subtopic: The chemistry involved in the titrimetric exercises |
74%
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