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Q. No.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
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 |
66%
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
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
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 |
77%
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 change in oxidation number of chlorine when Cl2 gas reacts with hot and concentrated sodium hydroxide solution is:
1. Zero to +1 and Zero to –5
2. Zero to –1 and Zero to +5
3. Zero to –1 and Zero to +3
4. Zero to +1 and Zero to –3
Subtopic: Balancing of Equations |
69%
Level 2: 60%+
AIPMT - 2012
Hints
Links
(a) H2O2 + O3 → H2O + 2O2
(b) H2O2 + Ag2O → 2Ag + H2O + O2
The role of hydrogen peroxide in the above reactions is respectively:
| 1. | Oxidizing in (a) and reducing in (b) |
| 2. | Reducing in (a) and oxidizing in (b) |
| 3. | Reducing in (a) and (b) |
| 4. | Oxidizing in (a) and (b) |
Subtopic: Oxidizing & Reducing Agents |
52%
Level 3: 35%-60%
AIPMT - 2014
Hints
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