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Q. No.The colour of Chromium sulphate in the following reaction is:
\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{SO}_4+3 \mathrm{SO}_2 \longrightarrow \mathrm{K}_2 \mathrm{SO}_4+\underset{\substack{\text { Chromium } \\ \text { sulphate }}}{\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3}\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+\mathrm{H}_2 \mathrm{O}\)
1. Green
2. Blue
3. White
4. Pink
Subtopic: Detection of Anions |
84%
Level 1: 80%+
Hints
\(\begin{aligned} & \mathrm{Na}_2 \mathrm{~S}+\mathrm{Na}_2\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right] \longrightarrow \text A \\ & \text { Sodium nitroprusside } \\ & \end{aligned} \)
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 |
81%
Level 1: 80%+
Hints
Which of the following anions can be detected using dilute \(\mathrm{H}_ 2 \mathrm{SO}_ 4\)?
| 1. | \(\mathrm{Cl}^{-}\) | 2. | \(\mathrm{CO}_3{ }^{2-}\) |
| 3. | \( \mathrm{OH}^{-} \) | 4. | \( \mathrm{PO}_4{ }^{3-}\) |
Subtopic: Detection of Anions |
77%
Level 2: 60%+
Hints
What is the group reagent used for the precipitation of group II basic radicals in qualitative analysis?
| 1. | \(\mathrm { Dilute } ~\mathrm{HCl}\) | 2. | \(\mathrm{Dilute }~ \mathrm{HCl}+\mathrm{H} _2 \mathrm{S} \) |
| 3. | \( \mathrm{Dilute~ H_{2}SO_{4} }\) | 4. | \(\mathrm { Dilute } ~\mathrm{NH}_{ 4} \mathrm{OH}\) |
Subtopic: Detection of Cations |
85%
Level 1: 80%+
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What is the purpose of using Mohr's salt in titration experiments?
1. To standardize the solution
2. To act as an indicator
3. To determine the volume of the analyte
4. To adjust the pH of the solution
1. To standardize the solution
2. To act as an indicator
3. To determine the volume of the analyte
4. To adjust the pH of the solution
Subtopic: The chemistry involved in the titrimetric exercises |
Level 3: 35%-60%
Hints
Which indicator is commonly used in the titration of Mohr's salt with potassium permanganate?
| 1. | Phenolphthalein | 2. | Methyl orange |
| 3. | Starch | 4. | None of the above |
Subtopic: The chemistry involved in the titrimetric exercises |
Level 3: 35%-60%
Hints
In the titration of oxalic acid with \(\mathrm{KMnO_4}\), what is the role of oxalic acid?
1. Oxidizing agent
2. Reducing agent
3. Indicator
4. Catalyst
1. Oxidizing agent
2. Reducing agent
3. Indicator
4. Catalyst
Subtopic: The chemistry involved in the titrimetric exercises |
71%
Level 2: 60%+
Hints
Which color change is observed at the endpoint when oxalic acid is titrated with potassium permanganate?
| 1. | From pink to colourless | 2. | From pink to yellow |
| 3. | From pink to brown | 4. | From pink to purple |
Subtopic: The chemistry involved in the titrimetric exercises |
Level 4: Below 35%
Hints
How can the equivalence point be determined in the titration of oxalic acid with \(\mathrm{KMnO_4}\)?
1. By using a pH indicator
2. By the appearance of a precipitate
3. By monitoring a sudden change in pH
4. By measuring the temperature change
1. By using a pH indicator
2. By the appearance of a precipitate
3. By monitoring a sudden change in pH
4. By measuring the temperature change
Subtopic: The chemistry involved in the titrimetric exercises |
51%
Level 3: 35%-60%
Hints
What is the chemical formula of Mohr's salt?
1. \(\mathrm{(NH_4)_2SO_4}\)
2. \(\mathrm{(NH_4)_2Fe(SO_4)_4.6H_2O}\)
3. \(\mathrm{FeSO_4.7H_2O}\)
4. \(\mathrm{FeSO_4(NH_4)_2(SO_4).6H_2O}\)
1. \(\mathrm{(NH_4)_2SO_4}\)
2. \(\mathrm{(NH_4)_2Fe(SO_4)_4.6H_2O}\)
3. \(\mathrm{FeSO_4.7H_2O}\)
4. \(\mathrm{FeSO_4(NH_4)_2(SO_4).6H_2O}\)
Subtopic: The chemistry involved in the titrimetric exercises |
79%
Level 2: 60%+
Hints
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