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Q. No.For the given redox reaction,
\(\mathrm{a} \mathrm{Cr}_2 \mathrm{O}_7^{2-}+\mathrm{bSO}_3^{2-}(\mathrm{aq})+\mathrm{c} \mathrm{H}^{+}(\mathrm{aq}) \rightarrow\)
\(2 \mathrm{a} \mathrm{Cr}^{3+}(\mathrm{aq})+\mathrm{bSO}_4^{2-}(\mathrm{aq})+\frac{\mathrm{c}}{2} \mathrm{H}_2 \mathrm{O}(\ell) \)
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 |
73%
From NCERT
NEET - 2023
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Which of the following reactions is a decomposition redox reaction?
| 1. | \(2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2(\mathrm{s}) \rightarrow 2 \mathrm{PbO}(\mathrm{s})+4 \mathrm{NO}_2(\mathrm{g})+\mathrm{O}_2(\mathrm{g}) \) |
| 2. | \(\mathrm{N}_2(\mathrm{g})+\mathrm{O}_2(\mathrm{g}) \rightarrow 2 \mathrm{NO}(\mathrm{g}) \) |
| 3. | \(\small{\mathrm{Cl}_2(\mathrm{g})+2 \mathrm{OH}^{-}(\mathrm{aq}) \rightarrow \mathrm{ClO}^{-}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq})+4 \mathrm{H}_2 \mathrm{O}(\ell)}\) |
| 4. | \(\small{\mathrm{P}_4(\mathrm{s})+3 \mathrm{OH}^{-}(\mathrm{aq})+3 \mathrm{H}_2 \mathrm{O}(\ell) \rightarrow\mathrm{PH}_3(\mathrm{g})+3 \mathrm{H}_2 \mathrm{PO}_2^{-}(\mathrm{aq})}\) |
Subtopic: Redox Titration & Type of Redox |
70%
From NCERT
NEET - 2022
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A set of species capable of showing disproportionation reactions is:
| 1. | ClO–2, ClO–3, ClO–4, Cl2 |
| 2. | Cl2, ClO–2, ClO–3, S8 |
| 3. | ClO–4, ClO–, ClO–2, F2 |
| 4. | ClO–3, ClO–4, H2O2, ClO– |
Subtopic: Redox Titration & Type of Redox |
60%
From NCERT
NEET - 2022
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At \(298 \mathrm{~K},\) the standard electrode potentials of \(\mathrm{Cu}^{2+} /\mathrm{Cu},\) \(\mathrm{Zn}^{2+} / \mathrm{Zn},~~ \mathrm{Fe}^{2+} / \mathrm{Fe}\) and \(\mathrm{Ag}^{+} / \mathrm{Ag} \) are \(0.34 \mathrm{~V}, -0.76 \mathrm{~V},\) \(-0.44 \mathrm{~V}\) and \(0.80 \mathrm{~V},\) respectively.
On the basis of standard electrode potentials, predict which of the following reaction can not occur?
On the basis of standard electrode potentials, predict which of the following reaction can not occur?
| 1. | \(2 \mathrm{CuSO}_{4}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s}) \rightarrow 2 \mathrm{Cu}(\mathrm{s})+\mathrm{Ag}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \) |
| 2. | \(\mathrm{CuSO}_{4}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \) \(\rightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s}) \) |
| 3. | \(\mathrm{CuSO}_{4}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) \) \(\rightarrow \mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s}) \) |
| 4. | \(\mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \) \(\rightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) \) |
Subtopic: Emf & Electrode Potential |
69%
From NCERT
NEET - 2022
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Identify the incorrect statement from the following :
| 1. | Lithium is the strongest reducing agent among the alkali metals. |
| 2. | Alkali metals react with water to form their hydroxides. |
| 3. | The oxidation number of K in KO2 is +4. |
| 4. | Ionisation enthalpy of alkali metals decreases from top to bottom in the group. |
Subtopic: Introduction to Redox and Oxidation Number |
67%
From NCERT
NEET - 2022
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Which reaction is NOT a redox reaction?
1. \(2 \mathrm{KClO}_3+\mathrm{I}_2 \rightarrow 2 \mathrm{KIO}_3+\mathrm{Cl}_2\)
2. \(\mathrm{H}_2+\mathrm{Cl}_2 \rightarrow 2 \mathrm{HCl}\)
3. \(\mathrm{BaCl}_2+\mathrm{Na}_2 \mathrm{SO}_4 \rightarrow \mathrm{BaSO}_4+2 \mathrm{NaCl}\)
4. \(\mathrm{Zn}+\mathrm{CuSO}_4 \rightarrow \mathrm{ZnSO}_4+\mathrm{Cu}\)
1. \(2 \mathrm{KClO}_3+\mathrm{I}_2 \rightarrow 2 \mathrm{KIO}_3+\mathrm{Cl}_2\)
2. \(\mathrm{H}_2+\mathrm{Cl}_2 \rightarrow 2 \mathrm{HCl}\)
3. \(\mathrm{BaCl}_2+\mathrm{Na}_2 \mathrm{SO}_4 \rightarrow \mathrm{BaSO}_4+2 \mathrm{NaCl}\)
4. \(\mathrm{Zn}+\mathrm{CuSO}_4 \rightarrow \mathrm{ZnSO}_4+\mathrm{Cu}\)
Subtopic: Introduction to Redox and Oxidation Number |
66%
From NCERT
NEET - 2024
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Hints
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Which of the following reaction is not a disproportionation reaction?
1. \(2 \mathrm{~F}_{2(g)}+2 \mathrm{OH}_{(a q)}^{-} \rightarrow 2 \mathrm{~F}_{(a q)}^{-}+\mathrm{OF}_{2(g)}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
2. \(\mathrm{Cl}_{2(g)}+2 \mathrm{OH}^{-}_{(a q)} \rightarrow \mathrm{ClO}_{(a q)}^{-}+\mathrm{Cl}_{(a q)}^{-}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
3. \(2 \mathrm{NO}_{2(g)}+2 \mathrm{OH}^{-}_{(\mathrm{aq})} \rightarrow \mathrm{NO}_{2(\mathrm{aq})}^{-}+\mathrm{NO}_{3(\mathrm{aq})}^{-}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
4. \(2 \mathrm{H}_2 \mathrm{O}_{2(aq)} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}+\mathrm{O}_{2(g)}\)
1. \(2 \mathrm{~F}_{2(g)}+2 \mathrm{OH}_{(a q)}^{-} \rightarrow 2 \mathrm{~F}_{(a q)}^{-}+\mathrm{OF}_{2(g)}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
2. \(\mathrm{Cl}_{2(g)}+2 \mathrm{OH}^{-}_{(a q)} \rightarrow \mathrm{ClO}_{(a q)}^{-}+\mathrm{Cl}_{(a q)}^{-}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
3. \(2 \mathrm{NO}_{2(g)}+2 \mathrm{OH}^{-}_{(\mathrm{aq})} \rightarrow \mathrm{NO}_{2(\mathrm{aq})}^{-}+\mathrm{NO}_{3(\mathrm{aq})}^{-}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
4. \(2 \mathrm{H}_2 \mathrm{O}_{2(aq)} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}+\mathrm{O}_{2(g)}\)
Subtopic: Redox Titration & Type of Redox |
61%
From NCERT
NEET - 2024
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Subtopic: Introduction to Redox and Oxidation Number |
69%
From NCERT
NEET - 2021
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The oxidation states not shown by Mn in given reaction is:
\(\mathrm{3MnO^{2-}_4+4H^+\rightarrow 2MnO^{2-}_4+MnO_{2}+2H_2O}\)
A. +6
B. +2
C. +4
D. +7
E. +3
Choose the most appropriate answer from the options given below:
1. D and E only
2. B and D only
3. A and B only
4. B and E only
\(\mathrm{3MnO^{2-}_4+4H^+\rightarrow 2MnO^{2-}_4+MnO_{2}+2H_2O}\)
A. +6
B. +2
C. +4
D. +7
E. +3
Choose the most appropriate answer from the options given below:
1. D and E only
2. B and D only
3. A and B only
4. B and E only
Subtopic: Introduction to Redox and Oxidation Number |
67%
From NCERT
NEET - 2024
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From the following, identify the reaction having the top position in the EMF series (standard reduction potential) according to their electrode potential at 298 K.
1. Mg2++ 2e–Mg(s)
2. Fe2+ + 2e– Fe(s)
3. Au3++ 3e–Au(s)
4. K++ le –K(s)
Subtopic: Application of Electrode Potential |
From NCERT
NEET - 2020
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