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Q. No.Find the percentage by mass of MnO₂ in a 2.0 g sample. The sample is treated with HCl to liberate Cl₂. The Cl₂ is passed through KI solution, and the liberated I₂ requires 60.0 mL of 0.1 M Na₂S₂O₃ for complete titration.
[Atomic numbers: Mn = 25, Cl = 17, O = 8, I = 53, Na = 11, K = 19, S = 16]
1. 9.0
2. 12
3. 15
4. 7.0
Subtopic: Redox Titration & Type of Redox |
71%
Level 2: 60%+
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\(\mathrm{0.01 ~M ~KMnO_4}\) solution was added to \(\mathrm{20.0 ~mL}\) of \(\mathrm{0.05~ M}\) Mohr’s salt solution through a burette. The initial reading of \(\mathrm{50 ~mL}\) burette is zero. How much volume of \(\mathrm{KMnO_4}\) solution is left in burette after the end point?
1. 10 ml
2. 20 ml
3. 30 ml
4. 40 ml
Subtopic: Redox Titration & Type of Redox |
70%
Level 2: 60%+
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Oxidation number of potassium in \(\mathrm{K}_2 \mathrm{O} , \mathrm{K}_2 \mathrm{O}_2\) and \(\mathrm{KO}_2\), respectively, is:
1. +2,+1 and +\(\frac{1}{2}\)
2. +1,+4 and +2
3. +1,+1 and +1
4. +1,+2 and +4
1. +2,+1 and +\(\frac{1}{2}\)
2. +1,+4 and +2
3. +1,+1 and +1
4. +1,+2 and +4
Subtopic: Introduction to Redox and Oxidation Number |
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Level 3: 35%-60%
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Which of the following oxoacids of sulphur contains ‘‘S’’ in two different oxidation states?
1. \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_3\)
2. \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_6\)
3. \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7\)
4. \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8\)
1. \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_3\)
2. \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_6\)
3. \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7\)
4. \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8\)
Subtopic: Introduction to Redox and Oxidation Number |
57%
Level 3: 35%-60%
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\(20 \mathrm{~mL}\) of \(0.02~ \mathrm{M} ~\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) solution is used for the titration of \(10 \mathrm{~mL}\) of \(\mathrm{Fe}^{2+}\) solution in the acidic medium. If the molarity of \(\mathrm{Fe}^{2+}\) solution is \(x\times 10^{-2} ~\mathrm{M}\), What is the value of \(x\)?
1. 12
2. 16
3. 20
4. 24
Subtopic: Redox Titration & Type of Redox |
79%
Level 2: 60%+
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\(\mathrm{20~mL~of~0.02~M}\) hypo solution is used for the titration of \(\mathrm{10 ~mL}\) of copper sulphate solution, in the presence of excess of \(\mathrm{KI}\) using starch as an indicator. The molarity of \(\mathrm{Cu^{2+}}\) is found to be \(x\times 10^{-2}~M\), Find the value of \(x\):
\([\text{Given :} 2 \mathrm{Cu}^{2+}+4 \mathrm{I}^{-} \rightarrow \mathrm{Cu}_2 \mathrm{I}_2+\mathrm{I}_2 \\ \mathrm{I}_2+2 \mathrm{~S}_2 \mathrm{O}_3^{2-} \rightarrow 2 \mathrm{I}^{-}+\mathrm{S}_4 \mathrm{O}_6^{2-} ]\)
1. 2
2. 4
3. 6
4. 8
Subtopic: Redox Titration & Type of Redox |
66%
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Which of the following reactions is not an example of a disproportionation reaction?
| 1. | \(2 \mathrm{H}_2 \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2 \) |
| 2. | \(2 \mathrm{NO}_2+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{HNO}_3+\mathrm{HNO}_2 \) |
| 3. | \(\mathrm{MnO}_4^{-}+4 \mathrm{H}^{+}+3 \mathrm{e}^{-} \rightarrow \mathrm{MnO}_2+2 \mathrm{H}_2 \mathrm{O} \) |
| 4. | \(3 \mathrm{MnO}_4^{2-}+4 \mathrm{H}^{+} \rightarrow 2 \mathrm{MnO}_4^{-}+\mathrm{MnO}_2+2 \mathrm{H}_2 \mathrm{O}\) |
Subtopic: Introduction to Redox and Oxidation Number |
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When \(10 ~ml\) of an aqueous solution of \(KMnO_4\) was titrated in acidic medium, equal volume of \(0.1~ M\) of an aqueous solution of ferrous sulphate was required for complete discharge of colour. How much is the strength of \(KMnO_4\) in grams per litre is \(x \times 10^{-2}\), The value of \(x\) is:
[Atomic mass of \({K}=39, {Mn}=53, {O}=16]\)
1. 230
2. 284
3. 316
4. 368
[Atomic mass of \({K}=39, {Mn}=53, {O}=16]\)
1. 230
2. 284
3. 316
4. 368
Subtopic: Redox Titration & Type of Redox |
79%
Level 2: 60%+
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The compound that cannot act as both an oxidizing and reducing agent is:
| 1. | \(H_2O_2\) | 2. | \(HNO_2\) |
| 3. | \(H_2SO_3\) | 4. | \(H_3PO_4\) |
Subtopic: Oxidizing & Reducing Agents |
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Which of the following sets of species contains only those that can undergo a disproportionation reaction?
| 1. | \(\mathrm{ClO_2^-,MnO^-_4}\) and \(\mathrm{CrO^{2-}_{7}}\) |
| 2. | \(\mathrm{ClO_2^-}\) and \(\mathrm{Mn^{3+}}\) |
| 3. | \(\mathrm{ClO^-_4,MnO^-_4}\)and \(\mathrm{ClO^-_2}\) |
| 4. | \(\mathrm{Cr_2O^{2-}_7,MnO^-_4}\) and \(\mathrm{Cl_2}\) |
Subtopic: Redox Titration & Type of Redox |
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