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Q. No.What is observed visually when ammonium hydroxide and hydrochloric acid react?
1.
Red coloration
2.
White fumes
3.
Blue precipitate
4.
No visible change
Subtopic: Detection of Anions |
88%
Level 1: 80%+
Hints
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 |
Subtopic: Detection of Anions |
74%
Level 2: 60%+
Hints
Which solvent is used to dissolve the mixture of o-nitroacetanilide and p-nitroacetanilide for separation?
1. Water
2. Ethanol
3. Acetone
4. Hexane
1. Water
2. Ethanol
3. Acetone
4. Hexane
Subtopic: Preparation of the Organic and Inorganic compounds |
51%
Level 3: 35%-60%
Hints
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 |
59%
Level 3: 35%-60%
Hints
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 |
61%
Level 2: 60%+
Hints
What is the ratio of aniline and glacial acetic acid used to synthesize acetanilide from aniline?
1. 2:6
2. 1:5
3. 2:3
4. 1:1
1. 2:6
2. 1:5
3. 2:3
4. 1:1
Subtopic: Preparation of the Organic and Inorganic compounds |
62%
Level 2: 60%+
Hints
Mark the reaction that is incorrect regarding the confirmatory test for acetate ion:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Detection of the functional groups |
Level 3: 35%-60%
Hints
A salt gives MnO2 , a light greenish-yellow pungent gas and effervescence on heating with conc. \(\mathrm{H}_2 \mathrm{SO}_4\):
This indicates the ions present in the salt are:
1. \(\mathrm{I^{-}ions.} \)
2. \(\mathrm{Br^{-}ions.} \)
3. \(\mathrm{Cl^{-}ions.} \)
4. \(\mathrm{S^{2-}ions.} \)
This indicates the ions present in the salt are:
1. \(\mathrm{I^{-}ions.} \)
2. \(\mathrm{Br^{-}ions.} \)
3. \(\mathrm{Cl^{-}ions.} \)
4. \(\mathrm{S^{2-}ions.} \)
Subtopic: Detection of Anions |
68%
Level 2: 60%+
Hints
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%
Level 1: 80%+
Hints
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. | \(\mathrm{Sn}^{2+}\) |
Subtopic: Detection of Cations |
Level 3: 35%-60%
Hints
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