On balancing 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 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 |
 71%
From NCERT
NEET - 2023
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The correct statement among the following for a redox couple is:
 
1. Both are oxidised forms involving the same element.
2. Both are reduced forms involving same element.
3. Both are reduced and oxidized forms involve the same element.
4. Cathode and anode together.
Subtopic:  Introduction to Redox and Oxidation Number |
 82%
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 |
 68%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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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 |
 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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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 change in oxidation number of carbon in the following reaction?

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

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 |
 78%
From NCERT
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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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++ 2eMg(s)
2. Fe2+ + 2e Fe(s)
3. Au3++ 3eAu(s)
4. K++ le K(s)

Subtopic:  Application of Electrode Potential |
From NCERT
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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