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Q. No.A metal solution when treated with dimethyl glyoxime and \(\text{NH}_4\text{OH}\) gives a rose-red complex. The metal is:
1. Ni
2. V
3. Co
4. Mn
1. Ni
2. V
3. Co
4. Mn
Subtopic: Detection of Cations |
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What is the purpose of the borax bead test?
1. To identify the presence of specific metallic ions
2. To determine the acidity of a solution
3. To test for the presence of organic compounds
4. To measure the concentration of a solute
1. To identify the presence of specific metallic ions
2. To determine the acidity of a solution
3. To test for the presence of organic compounds
4. To measure the concentration of a solute
Subtopic: Detection of extra elements |
81%
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Which acid is typically used for the preparation of standard solution of KMnO4?
1. Sulphuric acid
2. Hydrochloric acid
3. Phosphoric acid
4. Oxalic acid
1. Sulphuric acid
2. Hydrochloric acid
3. Phosphoric acid
4. Oxalic acid
Subtopic: The chemistry involved in the titrimetric exercises |
57%
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Which functional group gives a positive test with 2,4-Dinitrophenylhydrazine (2,4-DNPH) reagent?
1. Alcohol (-OH)
2. Ketone (C=O)
3. Carboxylic acid (COOH)
4. Ester (RCOO-)
1. Alcohol (-OH)
2. Ketone (C=O)
3. Carboxylic acid (COOH)
4. Ester (RCOO-)
Subtopic: Detection of the functional groups |
82%
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The correct representation of A and B in the following reaction are:
\(4 \mathrm{NaCl}+\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+6 \mathrm{H}_2 \mathrm{SO}_4 \longrightarrow 2 \mathrm{KHSO}_4+\underset{\begin{array}{c} \text { (Chromyl } \\ \text { chloride) } \end{array}}{\mathrm{A}}+4 \mathrm{NaHSO}_4+3 \mathrm{H}_2 \mathrm{O} \)
\(\begin{aligned} & \left(\mathrm{CH}_3 \mathrm{COO}\right)_2 \mathrm{~Pb}+\underset{\begin{array}{c} \text { Sodium} \\ \text { chromate } \end{array}}{\mathrm{Na_2CrO_4}} \longrightarrow \underset{\begin{array}{c} \text { Lead chromate} \\ \text {(Yellow precipitate)} \end{array}}{\mathrm{B}}+~~2 \mathrm{CH}_3 \mathrm{COONa} \\ \end{aligned}\\ \)
1. CrO3 and PbCrO4
2. CrO2Cl2 and PbCrO4
3. Cr2O7 and Pb CrO4
4. Cr2O7 and PbCl2
\(4 \mathrm{NaCl}+\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+6 \mathrm{H}_2 \mathrm{SO}_4 \longrightarrow 2 \mathrm{KHSO}_4+\underset{\begin{array}{c} \text { (Chromyl } \\ \text { chloride) } \end{array}}{\mathrm{A}}+4 \mathrm{NaHSO}_4+3 \mathrm{H}_2 \mathrm{O} \)
\(\begin{aligned} & \left(\mathrm{CH}_3 \mathrm{COO}\right)_2 \mathrm{~Pb}+\underset{\begin{array}{c} \text { Sodium} \\ \text { chromate } \end{array}}{\mathrm{Na_2CrO_4}} \longrightarrow \underset{\begin{array}{c} \text { Lead chromate} \\ \text {(Yellow precipitate)} \end{array}}{\mathrm{B}}+~~2 \mathrm{CH}_3 \mathrm{COONa} \\ \end{aligned}\\ \)
1. CrO3 and PbCrO4
2. CrO2Cl2 and PbCrO4
3. Cr2O7 and Pb CrO4
4. Cr2O7 and PbCl2
Subtopic: Detection of Anions |
92%
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What color precipitate indicates the presence of phosphate ions in the test solution containing ammonium molybdate solution,conc. HNO3 and boil to the test solution containing phosphate ions?
1. Blue
2. Canary yellow
3. Red
4. Green
1. Blue
2. Canary yellow
3. Red
4. Green
Subtopic: Detection of Anions |
86%
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What color does acetate turn when it reacts with a neutral ferric chloride solution?
1. Blue
2. Yellow
3. Deep red
4. Green
1. Blue
2. Yellow
3. Deep red
4. Green
Subtopic: Detection of Anions |
55%
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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. \(\mathrm{Hg_2Cl_2}\)
1. \(\mathrm{PbCl_2}\)
2. \(\mathrm{AgCl}\)
3. \(\mathrm{HgCl_2}\)
4. \(\mathrm{Hg_2Cl_2}\)
Subtopic: Detection of Cations |
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In the presence of zinc, what chemical process is hindered during the reaction involving aniline?
1. Reduction
2. Oxidation
3. Hydrolysis
4. Polymerization
1. Reduction
2. Oxidation
3. Hydrolysis
4. Polymerization
Subtopic: Preparation of the Organic and Inorganic compounds |
62%
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\(\begin{aligned} & \mathrm{Na}_2 \mathrm{~S}+\mathrm{Na}_2\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right] \longrightarrow \text A \\ & \text { Sodium nitroprusside } \\ & \end{aligned} \)
The formula of A is :
1. \(Na_4[Fe(CN)_5NOS]\)
2. \(Na_2[Fe(CN)_5NOS]\)
3. \(K_4[Fe(CN)_5NOS]\)
4. \(K_2 [Fe(CN)_4NOS]\)
The formula of A is :
1. \(Na_4[Fe(CN)_5NOS]\)
2. \(Na_2[Fe(CN)_5NOS]\)
3. \(K_4[Fe(CN)_5NOS]\)
4. \(K_2 [Fe(CN)_4NOS]\)
Subtopic: Detection of Anions |
83%
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