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Q. No.A metal solution, when treated with dimethyl glyoxime and NH₄OH, forms a rose-red complex. The metal involved is:
| 1. | Nickel (Ni) | 2. | Vanadium (V) |
| 3. | Cobalt (Co) | 4. | Manganese (Mn) |
Subtopic: Detection of Cations |
72%
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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 a standard solution of KMnO4?
| 1. | Sulphuric acid | 2. | Hydrochloric acid |
| 3. | Phosphoric acid | 4. | Oxalic acid |
Subtopic: The chemistry involved in the titrimetric exercises |
51%
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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-) |
Subtopic: Detection of the functional groups |
81%
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The correct representation of A and B in the following reaction are:
| \(\small 4\mathrm{NaCl}+{\mathrm K}_2{\mathrm{Cr}}_2{\mathrm O}_7+6{\mathrm H}_2{\mathrm{SO}}_4\longrightarrow2{\mathrm{KHSO}}_4+\underset{\begin{array}{c}\text{ (Chromyl }\\\text{ chloride) }\end{array}}{\mathbf A}\\\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\small +4{\mathrm{NaHSO}}_4+3{\mathrm H}_2\mathrm O\) |
| \(\small\begin{aligned} & \left(\mathrm{CH}_3 \mathrm{COO}\right)_2 \mathrm{~Pb}+\underset{\begin{array}{c} \text { Sodium} \\ \text { chromate } \end{array}}{\mathrm{Na_2CrO_4}} \longrightarrow \underset{\begin{array}{c} \text { Lead chromate} \\ \text {(Yellow precipitate)} \end{array}}{\mathbf{B}}+~~2 \mathrm{CH}_3 \mathrm{COONa} \\ \end{aligned}\\ \) |
| 1. | CrO3 and PbCrO4 | 2. | CrO2Cl2 and PbCrO4 |
| 3. | Cr2O7 and Pb CrO4 | 4. | Cr2O7 and PbCl2 |
Subtopic: Detection of Anions |
91%
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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 |
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 |
Subtopic: Detection of Anions |
54%
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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 |
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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 |
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:
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 |
80%
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