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Q. No.A white salt is insoluble in cold water but soluble in boiling water.
Its solution when treated with potassium chromate solution
gives a yellow precipitate. The salt may be:
1. \(BaCl_2 \)
2. \(SrCl_2 \)
3. \(PbCl_2\)
4. \(Hg(NO_3)_2\)
Its solution when treated with potassium chromate solution
gives a yellow precipitate. The salt may be:
1. \(BaCl_2 \)
2. \(SrCl_2 \)
3. \(PbCl_2\)
4. \(Hg(NO_3)_2\)
Subtopic: Detection of Cations | Detection of Anions |
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Level 2: 60%+
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A white powder when strongly heated gives off brown fumes. Aqueous solution of this powder gives a yellow precipitate with a solution of \(KI\). When a solution of barium chloride is added to a solution of this powder, a white precipitate results. This white powder may be:
1. A soluble sulphate
2. \(KBr \) and \(NaBr \)
3. \(Ba(NO_3)_2\)
4. \(AgNO_3\)
1. A soluble sulphate
2. \(KBr \) and \(NaBr \)
3. \(Ba(NO_3)_2\)
4. \(AgNO_3\)
Subtopic: Detection of Cations | Detection of Anions |
51%
Level 3: 35%-60%
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Ammonium dichromate is used in some fireworks. The green-coloured powder blown in the air is due to:
1. \(CrO_3 \)
2. \(Cr_2O_3 \)
3. \(Cr\)
4. \(CrO(O_2) \)
1. \(CrO_3 \)
2. \(Cr_2O_3 \)
3. \(Cr\)
4. \(CrO(O_2) \)
Subtopic: Detection of Cations |
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Level 2: 60%+
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A white precipitate obtained in the analysis of a mixture becomes black on treatment with \(\mathrm{NH_4OH}.\) It may be:
| 1. | \(\mathrm{PbCl_2}\) | 2. | \(\mathrm{AgCl}\) |
| 3. | \(\mathrm{HgCl_2}\) | 4. | \(\mathrm{Hg_2Cl_2}\) |
Subtopic: Detection of Cations |
Level 3: 35%-60%
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When a \(KI\) solution is added to a metal nitrate, a black precipitate is produced that dissolves in excess of \(KI\) to give an orange solution. The metal ion is:
1. \(Hg^{2+}\)
2. \(Bi^{3+}\)
3. \(Cu^{2+}\)
4. \(Pb^{2+}\)
1. \(Hg^{2+}\)
2. \(Bi^{3+}\)
3. \(Cu^{2+}\)
4. \(Pb^{2+}\)
Subtopic: Detection of Cations |
Level 3: 35%-60%
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Which of the following compounds does not exist?
1. \(CrO_2Br_2 \)
2. \(CrO_2Cl_2 \)
3. \(POCl_3 \)
4. \(BiOCl \)
1. \(CrO_2Br_2 \)
2. \(CrO_2Cl_2 \)
3. \(POCl_3 \)
4. \(BiOCl \)
Subtopic: Detection of Cations |
60%
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Salt (A) gives brick red fumes (B) with conc. \(H_2SO_4\) and \(K_2Cr_2O_7\) which gives yellow solution (C) with \(NaOH\) and it gives yellow ppt. (D) with acetic acid and lead acetate. What is (C)?
1. \(Na_2CrO_4 \)
2. \(CrO_2Cl_2 \)
3. \(PbCrO_4 \)
4. \(NaCl \)
1. \(Na_2CrO_4 \)
2. \(CrO_2Cl_2 \)
3. \(PbCrO_4 \)
4. \(NaCl \)
Subtopic: Detection of Cations |
Level 3: 35%-60%
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On adding \(KI\) solution in excess to a solution of \(CuSO_4\) we get a precipitate 'P and another liquor M. Select the correct pairs:
1. P is \(Cu_2I_2 \) and M is \(I_2\) solution
2. P is \(CuI_2 \) and M is \(I_2\) solution
3. P is \(Cu_2I_2 \) and M is \(KI_3\) solution
4. P is \(CuI_2 \) and M is \(KI_3\) solution
1. P is \(Cu_2I_2 \) and M is \(I_2\) solution
2. P is \(CuI_2 \) and M is \(I_2\) solution
3. P is \(Cu_2I_2 \) and M is \(KI_3\) solution
4. P is \(CuI_2 \) and M is \(KI_3\) solution
Subtopic: Detection of Anions |
53%
Level 3: 35%-60%
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A colourless water-soluble solid X on heating gives equimolar quantities of Y and Z. Y gives dense white fumes with \(HCl\) and Z does so with \(NH_3.\) Y gives a brown precipitate with Nessler's reagent and Z gives a white precipitate with nitrates of \(Ag^+, ~ Pb^{2+}\) and \(Hg^+.\) X, most probably, is:
1. \(NH_4Cl \)
2. \(NH_4NO_3 \)
3. \(NH_4NO_2 \)
4. \(FeSO_4\)
1. \(NH_4Cl \)
2. \(NH_4NO_3 \)
3. \(NH_4NO_2 \)
4. \(FeSO_4\)
Subtopic: Detection of Cations |
65%
Level 2: 60%+
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Consider the reaction scheme given below:
\(AgNO_3 \xrightarrow \Delta (W) +(X)+O_2 \)
\((X)+H_2O \rightarrow HNO_2 + HNO_3 \)
\((W) + H NO_3 \rightarrow Y + NO+ H_2O \)
\((Y) + Na_2S_2O_3 \) (excess) \(\rightarrow (Z)+NaNO_3 \)
Identify (W) to (Z) in the above reactions:
1. \(W = Ag, ~~X=N_2O~~~Y=AgNO_3, ~Z=Na_2[ Ag(S_2O_3)_2]~~~~~~\)
2. \(W = Ag_2O, ~~~~~X=NO,~Y=AgNO_3,~ ~Z=Na_3[ Ag(S_2O_3)_2]~~~~~~ \)
3. \(W = Ag, ~~~~~~~~X=NO_2,~~Y=AgNO_3,~ ~Z=Na_3[ Ag(S_2O_3)_2]~~~~~~ \)
4. \(W = Ag_2O, ~~~~~X=N_2,~~~~~~~~~~~~~~~Y=AgNO_3,~ ~Z=Na[ Ag(S_2O_3)_2]~~~~~~ \)
\(AgNO_3 \xrightarrow \Delta (W) +(X)+O_2 \)
\((X)+H_2O \rightarrow HNO_2 + HNO_3 \)
\((W) + H NO_3 \rightarrow Y + NO+ H_2O \)
\((Y) + Na_2S_2O_3 \) (excess) \(\rightarrow (Z)+NaNO_3 \)
Identify (W) to (Z) in the above reactions:
1. \(W = Ag, ~~X=N_2O~~~Y=AgNO_3, ~Z=Na_2[ Ag(S_2O_3)_2]~~~~~~\)
2. \(W = Ag_2O, ~~~~~X=NO,~Y=AgNO_3,~ ~Z=Na_3[ Ag(S_2O_3)_2]~~~~~~ \)
3. \(W = Ag, ~~~~~~~~X=NO_2,~~Y=AgNO_3,~ ~Z=Na_3[ Ag(S_2O_3)_2]~~~~~~ \)
4. \(W = Ag_2O, ~~~~~X=N_2,~~~~~~~~~~~~~~~Y=AgNO_3,~ ~Z=Na[ Ag(S_2O_3)_2]~~~~~~ \)
Subtopic: Detection of Cations |
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Level 3: 35%-60%
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