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. \(\mathrm{Zn}+\mathrm{CuSO}_4 \rightarrow \mathrm{ZnSO}_4+\mathrm{Cu}\)
Subtopic:  Introduction to Redox and Oxidation Number |
 66%
From NCERT
NEET - 2024
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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. \(2 \mathrm{H}_2 \mathrm{O}_{2(aq)} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}+\mathrm{O}_{2(g)}\)
Subtopic:  Redox Titration & Type of Redox |
 61%
From NCERT
NEET - 2024
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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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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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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?
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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A set of species capable of showing disproportionation reactions is:

1. ClO2, ClO3, ClO4, Cl2
2. Cl2, ClO2, ClO3, S8
3. ClO4, ClO, ClO2, F2
4. ClO3, ClO4, H2O2, ClO
Subtopic:  Redox Titration & Type of Redox |
 60%
From NCERT
NEET - 2022
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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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The correct example of metal displacement reaction among the following is:

1. Fe+2HClFeCl2+H2

2. 2Pb(NO3)22PbO+4NO2+O2

3. 2KClO32KCl+3O2

4. Cr2O3+2AlAl2O3+2Cr

Subtopic:  Introduction to Redox and Oxidation Number |
 69%
From NCERT
NEET - 2021
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What is the alteration in the oxidation state of carbon in the given reaction?

\(\mathrm{{CH_4}_{(g)} + 4{Cl_2}_{(g)} \rightarrow {CCl_4}_{(l)} + 4 HCl_{(g)}}\)

1. 0 to +4

2. –4 to +4

3. 0 to –4

4. +4 to +4

Subtopic:  Oxidizing & Reducing Agents |
 82%
From NCERT
NEET - 2020
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The incorrect oxidation number of the underlined atom in the following species is:

1. Cu2O is -1 2. Cl\(O_{3}^{-}\) is +5
3. K2Cr2O7 is +6 4. HAuCl4  is +3
Subtopic:  Oxidizing & Reducing Agents |
 79%
From NCERT
NEET - 2020
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