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Q. No.What is the first step in the preparation of p-nitroacetanilide?
1. Nitration of acetanilide
2. Acetylation of aniline
3. Nitration of nitrobenzene
4. Acetylation of nitrobenzene
Subtopic: Preparation of the Organic and Inorganic compounds |
67%
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In the preparation of p-nitroacetanilide, what role does acetic anhydride play?
1. It acts as a catalyst
2. It serves as a solvent
3. It acetylates the amino group
4. It nitrosylates the amino group
1. It acts as a catalyst
2. It serves as a solvent
3. It acetylates the amino group
4. It nitrosylates the amino group
Subtopic: Preparation of the Organic and Inorganic compounds |
75%
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Read the statements regarding the Nitrate \((NO^-_3)\) ion
Statement I: Mix the water extract with Fe(II) sulphate solution and add one drop of \(HNO_3\) along side of the test tube
Statement II: Formation of brown ring at the junction of the acid and the solution.
1. Statement I is incorrect and Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct and Statement II is incorrect.
Statement I: Mix the water extract with Fe(II) sulphate solution and add one drop of \(HNO_3\) along side of the test tube
Statement II: Formation of brown ring at the junction of the acid and the solution.
1. Statement I is incorrect and Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct and Statement II is incorrect.
Subtopic: Detection of Anions |
83%
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What is observed visually when ammonium hydroxide and hydrochloric acid react?
1. Red coloration
2. White fumes
3. Blue precipitate
4. No visible change
1. Red coloration
2. White fumes
3. Blue precipitate
4. No visible change
Subtopic: Detection of Anions |
89%
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Mark the correct representation of the compound that is formed when \(\mathrm{AgCl}\) reacts with ammonia:
1. \(\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right] \mathrm{Cl} \text { }\)
2. \(\left[\mathrm{Ag}\left(\mathrm{NH}_4\right)_2\right] \mathrm{Cl} \text { }\)
3. \(\left[\mathrm{Ag}\left(\mathrm{NH}_2\right)_2\right] \mathrm{} \text {Cl }\)
4. AgNO3
1. \(\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right] \mathrm{Cl} \text { }\)
2. \(\left[\mathrm{Ag}\left(\mathrm{NH}_4\right)_2\right] \mathrm{Cl} \text { }\)
3. \(\left[\mathrm{Ag}\left(\mathrm{NH}_2\right)_2\right] \mathrm{} \text {Cl }\)
4. AgNO3
Subtopic: Detection of Anions |
79%
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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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What is the primary reason for using a reflux condenser in organic chemistry experiments?
1. To accelerate the reaction rate
2. To maintain a constant temperature
3. To minimize contamination
4. To prevent evaporation of reactants or solvents
1. To accelerate the reaction rate
2. To maintain a constant temperature
3. To minimize contamination
4. To prevent evaporation of reactants or solvents
Subtopic: Preparation of the Organic and Inorganic compounds |
57%
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Mark the reaction that is incorrect regarding the confirmatory test for acetate ion:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Detection of the functional groups |
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Hints
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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The ion that cannot be precipitated by both \(\mathrm{HCl} \text { and } \mathrm{H}_2 \mathrm{~S} \) is :
1. \(\mathrm{Pb}^{2+}\)
2. \(\mathrm{Cu}^{+2}\)
3. \(\mathrm{Ag}^{+}\)
4. \(\mathrm{Sn}^{2+}\)
1. \(\mathrm{Pb}^{2+}\)
2. \(\mathrm{Cu}^{+2}\)
3. \(\mathrm{Ag}^{+}\)
4. \(\mathrm{Sn}^{2+}\)
Subtopic: Detection of Cations |
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