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Q. No.Given the following reaction involving manganese (Mn):
\(\mathrm{3MnO^{2-}_4+4H^+\rightarrow 2MnO^{-}_4+MnO_{2}+2H_2O}\)
\(\mathrm{3MnO^{2-}_4+4H^+\rightarrow 2MnO^{-}_4+MnO_{2}+2H_2O}\)
Which oxidation states of manganese are not observed in the above reaction?
A. +6
B. +2
C. +4
D. +7
E. +3
Mark 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 |
81%
Level 1: 80%+
NEET - 2024
Hints
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 |
65%
Level 2: 60%+
NEET - 2024
Hints
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%
Level 2: 60%+
NEET - 2022
Hints
The correct example of metal displacement reaction among the following is:
| 1. | \(\mathrm{Fe}+2 \mathrm{HCl} \rightarrow \mathrm{FeCl}_2+\mathrm{H}_2 \uparrow \) |
| 2. | \(2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2 \rightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_2+\mathrm{O}_2 \uparrow \) |
| 3. | \( 2\text {KClO}_3 \xrightarrow {\Delta}2 \text {KCl} + 3 \text O_2 \) |
| 4. | \(\mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al} \xrightarrow {\Delta} \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr}\) |
Subtopic: Introduction to Redox and Oxidation Number |
70%
Level 2: 60%+
NEET - 2021
Hints
Disproportionation reactions are:
| (a) | |
| (b) | |
| (c) | |
| (d) |
| 1. | (a) and (d) only | 2. | (a) and (b) only |
| 3. | (a), (b) and (c) | 4. | (a), (c) and (d) |
Subtopic: Introduction to Redox and Oxidation Number |
60%
Level 2: 60%+
NEET - 2019
Hints
For the given redox reaction, find out the coefficients a, b and c of a balanced equation respectively:
\(\mathrm{{a} {Cr}_2 {O}_7^{2-}+{bSO}_3^{2-}({aq})+{c} {H}^{+}({aq})} →\)\(\mathrm{2 {a} {Cr}^{3+}({aq})+{bSO}_4^{2-}({aq})+\frac{{c}}{2} {H}_2 {O}(\ell)} \)
\(\mathrm{{a} {Cr}_2 {O}_7^{2-}+{bSO}_3^{2-}({aq})+{c} {H}^{+}({aq})} →\)\(\mathrm{2 {a} {Cr}^{3+}({aq})+{bSO}_4^{2-}({aq})+\frac{{c}}{2} {H}_2 {O}(\ell)} \)
| 1. | 8, 1 and 3 | 2. | 1, 3 and 8 |
| 3. | 3, 8 and 1 | 4. | 1, 8 and 3 |
Subtopic: Balancing of Equations |
78%
Level 2: 60%+
NEET - 2023
Hints
For the redox reaction,
a
the correct stoichiometric coefficients of the reactants a, b, and c respectively for the balanced equation are:
| 1. | 16, 5, 2 | 2. | 2, 5, 16 |
| 3. | 2, 16, 5 | 4. | 5, 16, 2 |
Subtopic: Balancing of Equations |
82%
Level 1: 80%+
NEET - 2018
Hints
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: Introduction to Redox and Oxidation Number |
81%
Level 1: 80%+
NEET - 2020
Hints
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 |
83%
Level 1: 80%+
NEET - 2020
Hints
Subtopic: Oxidizing & Reducing Agents |
73%
Level 2: 60%+
NEET - 2019
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