Q. No.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 \(HgO.Hg(NH_2)I\)
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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The reagent used in the chromyl chloride test is:
1. \(K_2CrO_4 \)
2. \(CrO_3 \)
3. \(K_2Cr_2O_7 \)
4. \((NH_4)_2Cr_2O_7 \)
1. \(K_2CrO_4 \)
2. \(CrO_3 \)
3. \(K_2Cr_2O_7 \)
4. \((NH_4)_2Cr_2O_7 \)
Subtopic: Detection of Cations |
71%
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Two test tubes containing nitrate and bromide are treated separately with conc. H2SO4. Brown fumes, thus evolved, are passed in water. The water will be coloured by vapours evolved from the test tube containing:
1. Nitrate
2. Bromide
3. Both (a) and (b)
4. None of these
1. Nitrate
2. Bromide
3. Both (a) and (b)
4. None of these
Subtopic: Detection of Anions |
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