Q. No.Consider the following compounds:
\(\underline KO_2, H_2 \underline O_2\) and \(H_2 \underline SO_4\)
The oxidation states of the underlined elements in them are, respectively:
1. +1, -2 and +4
2. +4 , -4 and +6
3. +1, -1 and +6
4. +2, -2 and +6
\(\underline KO_2, H_2 \underline O_2\) and \(H_2 \underline SO_4\)
The oxidation states of the underlined elements in them are, respectively:
1. +1, -2 and +4
2. +4 , -4 and +6
3. +1, -1 and +6
4. +2, -2 and +6
Subtopic: Introduction to Redox and Oxidation Number |
61%
Level 2: 60%+
NEET - 2025
Please attempt this question first.
Hints
Please attempt this question first.
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 |
67%
Level 2: 60%+
NEET - 2024
Hints
Given the following reaction involving manganese
(\(\text{Mn}\)):\(\mathrm{3MnO^{2-}_4+4H^+\rightarrow 2MnO^{-}_4+MnO_{2}+2H_2O}\)
(\(\text{Mn}\)):\(\mathrm{3MnO^{2-}_4+4H^+\rightarrow 2MnO^{-}_4+MnO_{2}+2H_2O}\)
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
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%
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
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
Subtopic: Introduction to Redox and Oxidation Number |
76%
Level 2: 60%+
NEET - 2019
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 |
61%
Level 2: 60%+
NEET - 2019
Hints
Subtopic: Introduction to Redox and Oxidation Number |
63%
Level 2: 60%+
AIPMT - 2012
Hints
Best description of the behavior of bromine in the reaction given below is:
1. Both oxidized and reduced
2. Oxidized only
3. Reduced only
4. Proton acceptor only
Subtopic: Introduction to Redox and Oxidation Number |
88%
Level 1: 80%+
AIPMT - 2004
Hints
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