Q. No.Sodium nitroprusside gives a violet colour in an alkaline solution with:
1. \(S^{2-}\)
2. \(SO^{2-}_3\)
3. \(SO^{2-}_4\)
4. \(NO^{-}_2\)
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 |
80%
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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 |
55%
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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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An inorganic salt in its aqueous solution produced a white ppt with \(NaOH\) which dissolve in excess of \(NaOH.\) . Its aqueous solution produces light yellow ppt with \(AgNO_3\) and sparingly soluble in \(NH_4OH.\) . This salt, probably, is:
1. \(AlBr_3\)
2. \(AlI_3\)
3. \(AlCl_3\)
4. \(ZnCl\)
1. \(AlBr_3\)
2. \(AlI_3\)
3. \(AlCl_3\)
4. \(ZnCl\)
Subtopic: Detection of Cations |
51%
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Which of the following does not respond to the chromyl chloride test?
1. \(HgCl_2\)
2. \(CuCl_2\)
3. \(N iCl_2\)
4. \(MnCl_2\)
1. \(HgCl_2\)
2. \(CuCl_2\)
3. \(N iCl_2\)
4. \(MnCl_2\)
Subtopic: Detection of Cations |
65%
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Which of the following forms a black precipitate when \(H_2S\) gas is passed through its solution?
1. Acidic \(AgNO_3\)
2. \(Mg(NO_3)_2\)
3. Ammoniacal \(BaCl_2\)
4. All of them
1. Acidic \(AgNO_3\)
2. \(Mg(NO_3)_2\)
3. Ammoniacal \(BaCl_2\)
4. All of them
Subtopic: Detection of Cations |
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Which of the following combines with \(Fe ~(II) \) ions to form a brown complex?
1. \(N_2O \)
2. \(NO \)
3. \(N_2O_3 \)
4. \(N_2O_5 \)
1. \(N_2O \)
2. \(NO \)
3. \(N_2O_3 \)
4. \(N_2O_5 \)
Subtopic: Detection of Anions | Detection of extra elements |
78%
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Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produces purple colour ion due to formation of:
1. \(Na[Fe(H_2O)_5NOS]2 \)
2. \(Na_2[Fe(H_2O)_5NOS] \)
3. \(Na_3[Fe(CN)_5NOS] \)
4. \(Na_4[Fe(CN)_5NOS] \)
1. \(Na[Fe(H_2O)_5NOS]2 \)
2. \(Na_2[Fe(H_2O)_5NOS] \)
3. \(Na_3[Fe(CN)_5NOS] \)
4. \(Na_4[Fe(CN)_5NOS] \)
Subtopic: Detection of Anions |
62%
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