Q. No.Which of the following salt is insoluble in hot and dilute \(HNO_3\)?
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 |
56%
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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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Sodium nitroprusside gives a violet colour in an alkaline solution with:
1. \(S^{2-}\)
2. \(SO^{2-}_3\)
3. \(SO^{2-}_4\)
4. \(NO^{-}_2\)
1. \(S^{2-}\)
2. \(SO^{2-}_3\)
3. \(SO^{2-}_4\)
4. \(NO^{-}_2\)
Subtopic: Detection of Anions |
56%
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The brown ring test for NO3- is enabled due to the formation of the complex ion with the formula:
1. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \)
2. \(\mathrm{Fe}\left[\mathrm{NO}(\mathrm{CN})_5\right]^{2-} \)
3. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+} \)
4. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)(\mathrm{NO})_5\right]^{2+} \)
1. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \)
2. \(\mathrm{Fe}\left[\mathrm{NO}(\mathrm{CN})_5\right]^{2-} \)
3. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+} \)
4. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)(\mathrm{NO})_5\right]^{2+} \)
Subtopic: Detection of Anions |
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A chloride salt (A) upon reaction with an alkali solution gives gas (B) which in turn gives brown ppt (C) with Nessler’s reagent. A, B, and C are respectively:
1. \(NH_4Cl, NH_3\) and \(HgO\)
2. \(NH_4Cl, NH_3\) and \(Hg(NH_2)Cl\)
3. \(NH_4Cl, NH_3\) and \(HgO.Hg(NH_2)Cl\)
4. \(NH_4Cl, NH_3\) and \(HgO.Hg(NH_2)I\)
1. \(NH_4Cl, NH_3\) and \(HgO\)
2. \(NH_4Cl, NH_3\) and \(Hg(NH_2)Cl\)
3. \(NH_4Cl, NH_3\) and \(HgO.Hg(NH_2)Cl\)
4. \(NH_4Cl, NH_3\) and \(HgO.Hg(NH_2)I\)
Subtopic: Detection of Cations |
58%
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A white sublimable substance turns black on treatment with an \(NH_3\) The substance may be:
1. \(Hg_2Cl_2\)
2. \(HgCl_2\)
3. \(As_2O_2\)
4. \(NH_4Cl\)
1. \(Hg_2Cl_2\)
2. \(HgCl_2\)
3. \(As_2O_2\)
4. \(NH_4Cl\)
Subtopic: Detection of Cations |
58%
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Which of the following pairs of cations cannot be separated by using \(NH_3\) solution?
1. \(Pb^{2+},Zn^{2+}\)
2. \(Pb^{2+},Cu^{2+}\)
3. \(Zn^{2+},Cu^{2+}\)
4. \(Al^{3+},Ag^{+}\)
1. \(Pb^{2+},Zn^{2+}\)
2. \(Pb^{2+},Cu^{2+}\)
3. \(Zn^{2+},Cu^{2+}\)
4. \(Al^{3+},Ag^{+}\)
Subtopic: Detection of Cations |
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