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Q. No.Which of the following undergoes disproportionation reaction in aqueous alkaline medium?
1.
\(\mathrm{I}_2~ \text {and}~ \mathrm{Cl}_2\) only
2.
\(\mathrm{F}_2~\text {and}~\mathrm{Cl}_2\) only
3.
\(\mathrm{I}_2~\text {and}~\mathrm{Br}_2\) only
4.
\(\mathrm{Cl}_2, \mathrm{Br}_2~\text {and}~\mathrm{I}_2\) only
Subtopic: Redox Titration & Type of Redox |
68%
Level 2: 60%+
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Find the number of moles of H⁺ ions required for 1 mole of MnO₄⁻ to oxidise oxalate ions
completely to CO₂ in an acidic medium.
1. Eight (8)
2. Four (4)
3. Ten (10)
4. seven (7)
completely to CO₂ in an acidic medium.
1. Eight (8)
2. Four (4)
3. Ten (10)
4. seven (7)
Subtopic: Balancing of Equations |
54%
Level 3: 35%-60%
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\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+\mathrm{xH}^{+}+\mathrm{ye}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+\mathrm{AH}_2 \mathrm{O}\)
Balance the above reaction and find \(\text{x,y}~ \text{and} ~\text{A}\):
1. \(\text{x}=7,\text{y}=6,\text{A}=14\)
2. \(\text{x}=14,\text{y}=6,\text{A}=7\)
3. \(\text{x}=14,\text{y}=3,\text{A}=7\)
4. \(\text{x}=8,\text{y}=2,\text{A}=1\)
Balance the above reaction and find \(\text{x,y}~ \text{and} ~\text{A}\):
1. \(\text{x}=7,\text{y}=6,\text{A}=14\)
2. \(\text{x}=14,\text{y}=6,\text{A}=7\)
3. \(\text{x}=14,\text{y}=3,\text{A}=7\)
4. \(\text{x}=8,\text{y}=2,\text{A}=1\)
Subtopic: Balancing of Equations |
85%
Level 1: 80%+
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Given below are two statements:
| Statement I: | Potassium hydrogen phthalate is primary standard for \(NaOH\) solution. |
| Statement II: | Phenolphthalein is used to detect completion of titration. |
| 1. | Both statement-I and statement-II are correct |
| 2. | Statement-I is correct and statement-II is incorrect |
| 3. | Statement-I is incorrect and statement-II is correct |
| 4. | Both statement-I and statement-II are incorrect |
Subtopic: Redox Titration & Type of Redox |
82%
Level 1: 80%+
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Which of the following is a disproportionation reaction?
1. All A, B, C and D
2. A and B only
3. A and C only
4. A, B and C only
| A. | \(\mathrm{Cu}^{+} \longrightarrow \mathrm{Cu}^{2+}+\mathrm{Cu}\) |
| B. | \(\mathrm{MnO}_4^{2-} \longrightarrow \mathrm{MnO}_4^{-}+\mathrm{MnO}_2\) |
| C. | \(\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{O}_2+\mathrm{H}_2 \mathrm{O}\) |
| D. | \(\mathrm{CrO}_4^{2-} \longrightarrow \mathrm{Cr}^{3+}+\mathrm{H}_2 \mathrm{O}\) |
2. A and B only
3. A and C only
4. A, B and C only
Subtopic: Redox Titration & Type of Redox |
78%
Level 2: 60%+
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Hints
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Arrange the following compounds according to their decreasing oxidising power:
\(\mathrm{BrO}_4^{-}, \mathrm{IO}_4^{-}, \mathrm{ClO}_4^{-}\)
1. \( \mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}\)
2. \(\mathrm{BrO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{ClO}_4^{-}\)
3. \(\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}\)
4. \( \mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}\)
\(\mathrm{BrO}_4^{-}, \mathrm{IO}_4^{-}, \mathrm{ClO}_4^{-}\)
1. \( \mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}\)
2. \(\mathrm{BrO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{ClO}_4^{-}\)
3. \(\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}\)
4. \( \mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}\)
Subtopic: Oxidizing & Reducing Agents |
Level 4: Below 35%
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How many of the following show disproportionation reaction?
\(\mathrm{H}_2 \mathrm{O}_2, \mathrm{Ag}, \mathrm{Cu}^{+}, \mathrm{K}^{+}, \mathrm{F}_2, \mathrm{Cl}_2, \mathrm{ClO}_3^{-}\)
1. Four (4)
2. One (1)
3. Six (6)
4. Two (2)
\(\mathrm{H}_2 \mathrm{O}_2, \mathrm{Ag}, \mathrm{Cu}^{+}, \mathrm{K}^{+}, \mathrm{F}_2, \mathrm{Cl}_2, \mathrm{ClO}_3^{-}\)
1. Four (4)
2. One (1)
3. Six (6)
4. Two (2)
Subtopic: Introduction to Redox and Oxidation Number |
83%
Level 1: 80%+
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Hints
After completing the reaction, find out sum of the coefficients of all the species involved in the balanced equation:
\(2 \mathrm{MnO}_4^{-}+\mathrm{I}^{-} \xrightarrow[\text { Medium }]{\text { Alkaline }}\)
1. 8
2. 9
3. 6
4. 4
\(2 \mathrm{MnO}_4^{-}+\mathrm{I}^{-} \xrightarrow[\text { Medium }]{\text { Alkaline }}\)
1. 8
2. 9
3. 6
4. 4
Subtopic: Balancing of Equations |
61%
Level 2: 60%+
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Hints
Balance the following chemical equation and choose the option with the correct set of values of x, y, z, and p:
\(\mathrm{xCl}_2+\mathrm{yOH}^{-} \longrightarrow \mathrm{zCl}^{-}+\mathrm{pClO}^{-}\)
1. \(\text{x}=1,\text{y}=2,\text{z}=2,\text{p}=1\)
2. \(\text{x}=\text{y}=\text{z}=\text{p}=1\)
3. \(\text{x}=1,\text{y}=1,\text{z}=2,\text{p}=1\)
4. \(\text{x}=1,\text{y}=2,\text{z}=1,\text{p}=1\)
\(\mathrm{xCl}_2+\mathrm{yOH}^{-} \longrightarrow \mathrm{zCl}^{-}+\mathrm{pClO}^{-}\)
1. \(\text{x}=1,\text{y}=2,\text{z}=2,\text{p}=1\)
2. \(\text{x}=\text{y}=\text{z}=\text{p}=1\)
3. \(\text{x}=1,\text{y}=1,\text{z}=2,\text{p}=1\)
4. \(\text{x}=1,\text{y}=2,\text{z}=1,\text{p}=1\)
Subtopic: Balancing of Equations |
Level 3: 35%-60%
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Which of the following cannot as an oxidising agent?
1. \(\mathrm{MnO}_4^{-}\)
2. \(\mathrm{SO}_4^{2-}\)
3. \(\mathrm{N}^{3-}\)
4. \(\mathrm{BrO}_3^{-}\)
1. \(\mathrm{MnO}_4^{-}\)
2. \(\mathrm{SO}_4^{2-}\)
3. \(\mathrm{N}^{3-}\)
4. \(\mathrm{BrO}_3^{-}\)
Subtopic: Oxidizing & Reducing Agents |
78%
Level 2: 60%+
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