Q. No.Which of the following gives foul-smelling gas with the smell of rotten eggs with dil. \(H_2SO_4\)?
1. \(CO^{2-}_3\)
2. \(SO^{2-}_3\)
3. \(S^{2-}\)
4. \(NO^-_2\)
Subtopic: Detection of Anions |
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Subtopic: Detection of Anions |
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A substance on treatment with dil. \(H_2SO_4\) liberates a colourless gas that produces
(i) turbidity with baryta water
(ii) turns acidified dichromate solution green
The reaction indicates the presence of:
1. \(CO^{2-}_3\)
2. \(S^{2-}\)
3. \(SO^{2-}_3\)
4. \(NO^{-}_2\)
(i) turbidity with baryta water
(ii) turns acidified dichromate solution green
The reaction indicates the presence of:
1. \(CO^{2-}_3\)
2. \(S^{2-}\)
3. \(SO^{2-}_3\)
4. \(NO^{-}_2\)
Subtopic: Detection of Anions |
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When a mixture of solid NaCl, solid \(K_2Cr_2O_7\) is heated with conc. \(H_2SO_4\), orange red vapours are obtained.
The chemical name of red vapour is:
1. Chromous chloride
2. Chromyl chloride
3. Chromic chloride
4. Chromic sulphate
The chemical name of red vapour is:
1. Chromous chloride
2. Chromyl chloride
3. Chromic chloride
4. Chromic sulphate
Subtopic: Detection of Cations |
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An aqueous solution contains the ions as \(Hg^{2+}_2 , Hg^{2+}, Pb^{2+}~ \text {and} ~Cd^{2+}\). The addition of dilute HCl (6N) precipitates:
1. \(Hg_2Cl_2 \) only
2. \(PbCl_2\) only
3. \(PbCl_2\) and \(HgCl\)
4. \(HgCl_2\) and \(PbCl_2\)
1. \(Hg_2Cl_2 \) only
2. \(PbCl_2\) only
3. \(PbCl_2\) and \(HgCl\)
4. \(HgCl_2\) and \(PbCl_2\)
Subtopic: Detection of Cations |
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Which of the following salt is insoluble in hot and dilute \(HNO_3\)?
1. HgS
2. PbS
3. CuS
4. CdS
1. HgS
2. PbS
3. CuS
4. CdS
Subtopic: Detection of Cations |
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The compound that is not soluble in acetic acid is:
1. Calcium oxide
2. Calcium carbonate
3. Calcium oxalate
4. Calcium hydroxide
1. Calcium oxide
2. Calcium carbonate
3. Calcium oxalate
4. Calcium hydroxide
Subtopic: Detection of Cations |
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\(\mathrm{CrCl}_3 \underset{\mathrm{NH}_4 \mathrm{Cl}}{\longrightarrow} \rightarrow(\mathrm{O}) \stackrel{\mathrm{Na}_2 \mathrm{O}_2}{\mathrm{H}_2 \mathrm{O}} \longrightarrow \text { (B) } \underset{\text { Acetate }}{\longrightarrow} \text { (C) } \)
In the above reaction sequence, the compound (C) is:
1. \(Na_2CrO_4\)
2. \(Na_2Cr_2O_7\)
3. \(Cr(OH)_3\)
4. \(PbCrO_4\)
Subtopic: Detection of Cations |
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A reagent that can separate a mixture of AgCl and AgI is:
1. KCN
2. \(Na_2S_2O_3 \)
3. \(dil HNO_3 \)
4. \(NH_3 \)
1. KCN
2. \(Na_2S_2O_3 \)
3. \(dil HNO_3 \)
4. \(NH_3 \)
Subtopic: Detection of Anions |
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What is the product when NaBr and concentrated H2SO4 are heated together?
1. HOBr
2. HBr
3. \(Br_2\)
4. \(HBrO_3\)
1. HOBr
2. HBr
3. \(Br_2\)
4. \(HBrO_3\)
Subtopic: Detection of Anions |
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