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Q. No.Consider the following reaction:
\(\mathrm{CrCl}_3 \xrightarrow[\mathrm{NH}_4 \mathrm{OH}]{\mathrm{NH}_4 \mathrm{Cl}}(O) \xrightarrow[\text { }]{\mathrm{Na}_2 \mathrm{O}_2~ \mathrm{sol}^{\mathrm{n}}}(\mathrm{~B}) \xrightarrow [\text { aceate }]{\mathrm{lead} \mathrm{}~ \mathrm{}^{\mathrm{}}} (C)\)
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 |
64%
Level 2: 60%+
Hints
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 |
Level 3: 35%-60%
Hints
Brown ppt (A) dissolves in \(HNO_3\), gives (B) which in turn gives white ppt (C) with \(NH_4OH\). (C) on reaction with HCl gives solution (D), which gives white turbidity on addition of water. What is (D)?
1. \(Ca(OH)_2\)
2. \(Bi(OH)_3\)
3. BiOCl
4. \(Bi(NO_3)_3\)
1. \(Ca(OH)_2\)
2. \(Bi(OH)_3\)
3. BiOCl
4. \(Bi(NO_3)_3\)
Subtopic: Detection of Cations |
Level 3: 35%-60%
Please attempt this question first.
Hints
What is the product when NaBr and concentrated H2SO4 are heated together?
| 1. | HOBr | 2. | HBr |
| 3. | \(Br_2\) | 4. | \(HBrO_3\) |
Subtopic: Detection of Anions |
Level 3: 35%-60%
Hints
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 |
Level 3: 35%-60%
Hints
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 |
75%
Level 2: 60%+
Hints
The solution of a chemical compound (X) reacts with \(AgNO_3\) solution to form a white precipitate of (Y) which in turn dissolves in \(NH_4OH \) to give a complex (Z). When (Z) is treated with dilute \(HNO_3,\) (Y) reappears. The chemical compound X can be :
1. \(NaCl \)
2. \(CH_3Cl \)
3. \(NaBr \)
4. \(NaI \)
1. \(NaCl \)
2. \(CH_3Cl \)
3. \(NaBr \)
4. \(NaI \)
Subtopic: Detection of the functional groups |
74%
Level 2: 60%+
Hints
Which of the following species is detected using Nessler's reagent?
1. \(CrO^{2-}_4\)
2. \(PO^{3-}_4\)
3. \(MnO^{-}_4\)
4. \(NH^{+}_4\)
1. \(CrO^{2-}_4\)
2. \(PO^{3-}_4\)
3. \(MnO^{-}_4\)
4. \(NH^{+}_4\)
Subtopic: Detection of Cations |
80%
Level 1: 80%+
Hints
A gas (X) is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with the evolution of a colourless gas (Y). X and Y, respectively, are:
1. \(X= CO_2,~Y=Cl_2 \)
2. \(X= Cl_2,~Y=CO_2 \)
3. \(X= Cl_2,~Y=H \)
4. \(X= H,~Y=Cl_2 \)
1. \(X= CO_2,~Y=Cl_2 \)
2. \(X= Cl_2,~Y=CO_2 \)
3. \(X= Cl_2,~Y=H \)
4. \(X= H,~Y=Cl_2 \)
Subtopic: Detection of Anions |
Level 4: Below 35%
Hints
\(Cu^{2+}\) ions can be reduced to \(Cu^{+}\) ions by the addition of an aqueous solution of:
1. \(KF \)
2. \(KCl \)
3. \(KI \)
4. \(KOH \)
1. \(KF \)
2. \(KCl \)
3. \(KI \)
4. \(KOH \)
Subtopic: Detection of Cations | Detection of Anions |
63%
Level 2: 60%+
Hints
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