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Q. No.For the given redox reaction,
\(\mathrm{{a} {Cr}_2 {O}_7^{2-}+{bSO}_3^{2-}({aq})+{c} {H}^{+}({aq})} →\)
\(\mathrm{2 {a} {Cr}^{3+}({aq})+{bSO}_4^{2-}({aq})+\frac{{c}}{2} {H}_2 {O}(\ell)} \)
the coefficients a, b and c of a balanced equation are found to be, respectively:
1. 8, 1, 3
2. 1, 3, 8
3. 3, 8, 1
4. 1, 8, 3
Subtopic: Balancing of Equations |
77%
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NEET - 2023
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The molar conductance of a solution, given its conductivity (0.248 S m–1) and concentration (0.2 mol m–3) is:
1. 0.124 S cm2 mol–1
2. 1.24 S m2 mol–1
3. 124 S cm2 mol–1
4. 124 S m2 mol–1
1. 0.124 S cm2 mol–1
2. 1.24 S m2 mol–1
3. 124 S cm2 mol–1
4. 124 S m2 mol–1
Subtopic: Conductance & Conductivity |
From NCERT
NEET - 2023
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NEET 2025 - Target Batch
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Which element is being reduced in the following equation?
\(\small{\begin{gathered} 3 \mathrm{Cu}(s)+8 \mathrm{HNO}_3(a q) \rightarrow 2 \mathrm{NO}(g)+3 \mathrm{Cu}\left(\mathrm{NO}_3\right)_2(a q)+4 \mathrm{H}_2 \mathrm{O}(l) \end{gathered}}\)
\(\small{\begin{gathered} 3 \mathrm{Cu}(s)+8 \mathrm{HNO}_3(a q) \rightarrow 2 \mathrm{NO}(g)+3 \mathrm{Cu}\left(\mathrm{NO}_3\right)_2(a q)+4 \mathrm{H}_2 \mathrm{O}(l) \end{gathered}}\)
| 1. | Cu | 2. | H |
| 3. | N | 4. | O |
Subtopic: Oxidizing & Reducing Agents |
85%
From NCERT
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Which species possesses an atom exhibiting an oxidation number of +3?
1. ClO2-
2. PO43-
3. S2O32-
4. NO2+
1. ClO2-
2. PO43-
3. S2O32-
4. NO2+
Subtopic: Introduction to Redox and Oxidation Number |
84%
From NCERT
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Given below are two statements:
| Assertion (A): | In the following chemical reaction between \(H_2S(g)\) and \(Cl_2(g)\), \(H_2S(g)\) is oxidized to \(S(s)\) \(H_2S(g) +Cl_2(g) \rightarrow 2HCl(g) +S(s) \) |
| Reason (R): | Electropositive element, hydrogen has been removed from S. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Redox Titration & Type of Redox |
82%
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Identify the correct statements:
In light of the above statements choose the correct answer from the options given below:
| Statement I: | KMnO4 acts as a self-indicator in a redox titration. |
| Statement II: | ClO3- does not show a disproportionation reaction. |
| 1. | Statement I is correct, and Statement II is incorrect. |
| 2. | Statement I is incorrect, and Statement II is correct. |
| 3. | Statement I is correct, and Statement II is correct. |
| 4. | Statement I is incorrect, and Statement II is incorrect. |
Subtopic: Redox Titration & Type of Redox |
76%
From NCERT
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Given below are two statements:
In light of the above statements choose the correct answer from the options given below:
| Statement I: | In oxygen difluoride (OF2) and dioxygen difluoride (O2F2), the oxidation state of oxygen is –2 and –1, respectively. |
| Statement II: | The liberation of iodine from the reaction of Cu2+ ions on iodide ions, gives an intense red colour to starch. |
In light of the above statements choose the correct answer from the options given below:
| 1. | Statement I is correct, and Statement II is correct. |
| 2. | Statement I is incorrect, and Statement II is correct. |
| 3. | Statement I is correct, and Statement II is incorrect. |
| 4. | Statement I is incorrect, and Statement II is incorrect. |
Subtopic: Introduction to Redox and Oxidation Number |
From NCERT
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Subtopic: Introduction to Redox and Oxidation Number |
83%
From NCERT
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The given-below reaction can be classified as:
\(2PbO + 4HNO_3 \rightarrow 2Pb(NO_3)_2 + 2H_2O\)
1. Combination reaction
2. Redox reaction
3. Acid-base reaction
4. Disproportion reaction
\(2PbO + 4HNO_3 \rightarrow 2Pb(NO_3)_2 + 2H_2O\)
1. Combination reaction
2. Redox reaction
3. Acid-base reaction
4. Disproportion reaction
Subtopic: Redox Titration & Type of Redox |
55%
From NCERT
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Identify the oxidant (O) and reductant (R) in the following reaction:
\(Pb_3O_4 + 8HCl \rightarrow 3PbCl_2 + Cl_2 + 4H_2O \)
1. \(\mathrm{{O}={PbO}}, \ \mathrm{{R}= {Cl}^{-}} \)
2. \(\mathrm{{O}={PbO}_2}, \ \mathrm{{R}= {PbO}} \)
3. \(\mathrm{{O}={PbO}}, \ \mathrm{{R}= {PbO}_2} \)
4. \(\mathrm{{O}={PbO}_2}, \ \mathrm{{R}= {Cl}^{-}}\)
\(Pb_3O_4 + 8HCl \rightarrow 3PbCl_2 + Cl_2 + 4H_2O \)
1. \(\mathrm{{O}={PbO}}, \ \mathrm{{R}= {Cl}^{-}} \)
2. \(\mathrm{{O}={PbO}_2}, \ \mathrm{{R}= {PbO}} \)
3. \(\mathrm{{O}={PbO}}, \ \mathrm{{R}= {PbO}_2} \)
4. \(\mathrm{{O}={PbO}_2}, \ \mathrm{{R}= {Cl}^{-}}\)
Subtopic: Oxidizing & Reducing Agents |
69%
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