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Q. No.Identify the oxidant (O) and reductant (R) in the following reaction:
\(Pb_3O_4 + 8HCl \rightarrow 3PbCl_2 + Cl_2 + 4H_2O \)
1. \(\mathrm{{O}={PbO}}, \ \mathrm{{R}= {Cl}^{-}} \)
2. \(\mathrm{{O}={PbO}_2}, \ \mathrm{{R}= {PbO}} \)
3. \(\mathrm{{O}={PbO}}, \ \mathrm{{R}= {PbO}_2} \)
4. \(\mathrm{{O}={PbO}_2}, \ \mathrm{{R}= {Cl}^{-}}\)
Subtopic: Oxidizing & Reducing Agents |
69%
From NCERT
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The given-below reaction can be classified as:
\(2PbO + 4HNO_3 \rightarrow 2Pb(NO_3)_2 + 2H_2O\)
1. Combination reaction
2. Redox reaction
3. Acid-base reaction
4. Disproportion reaction
\(2PbO + 4HNO_3 \rightarrow 2Pb(NO_3)_2 + 2H_2O\)
1. Combination reaction
2. Redox reaction
3. Acid-base reaction
4. Disproportion reaction
Subtopic: Redox Titration & Type of Redox |
55%
From NCERT
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Subtopic: Introduction to Redox and Oxidation Number |
83%
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Which of the following reactions is a decomposition redox reaction?
| 1. | \(\mathrm{2 {Pb}\left({NO}_3\right)_2({s}) \rightarrow 2 {PbO}({s})+4 {NO}_2({g})+{O}_2({g})} \) |
| 2. | \(\mathrm{{N}_2({g})+{O}_2({g}) \rightarrow 2 {NO}({g})} \) |
| 3. | \(\small{\mathrm{{Cl}_2({g})+2 {OH}^{-}({aq}) \rightarrow {ClO}^{-}({aq})+{Cl}^{-}({aq})+4 {H}_2 {O}(\ell)}}\) |
| 4. | \(\small{\mathrm{{P}_4({s})+3 {OH}^{-}({aq})+3 {H}_2 {O}(\ell) \rightarrow{PH}_3({g})+3 {H}_2 {PO}_2^{-}({aq})}}\) |
Subtopic: Redox Titration & Type of Redox |
72%
From NCERT
NEET - 2022
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A set of species capable of showing disproportionation reactions is:
| 1. | \(\mathrm{ClO^–_2, ~ClO^–_3,~ ClO^–_4, ~Cl_2}\) |
| 2. | \(\mathrm{Cl_2, ~ClO^–_2, ~ClO^–_3, ~S_8}\) |
| 3. | \(\mathrm{ClO^–_4, ~ClO^–, ~ClO^–_2, ~F_2}\) |
| 4. | \(\mathrm{ClO^–_3, ~ClO^–_4, ~H_2O_2, ~ClO^–}\) |
Subtopic: Redox Titration & Type of Redox |
62%
From NCERT
NEET - 2022
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At \(298 {~K},\) the standard electrode potentials of \(\mathrm{{Cu}^{2+} /{Cu},}\) \(\mathrm{{Zn}^{2+} / {Zn},~~ {Fe}^{2+} / {Fe}}\) and \(\mathrm{{Ag}^{+} / {Ag}} \) are \(\mathrm{0.34 {~V}, -0.76 {~V},}\) \(\mathrm{-0.44 {~V}}\) and \(\mathrm{0.80 {~V},}\) respectively.
On the basis of standard electrode potentials, predict which of the following reaction can not occur?
On the basis of standard electrode potentials, predict which of the following reaction can not occur?
| 1. | \(\mathrm{2 {CuSO}_{4}({aq})+2 {Ag}({s}) → 2 {Cu}({s})+{Ag}_{2} {SO}_{4}({aq})} \) |
| 2. | \(\mathrm{{CuSO}_{4}({aq})+{Zn}({s})} \) \(\mathrm{→ {ZnSO}_{4}({aq})+{Cu}({s})} \) |
| 3. | \(\mathrm{{CuSO}_{4}({aq})+{Fe}({s})} \) \(\mathrm{→ {FeSO}_{4}({aq})+{Cu}({s})} \) |
| 4. | \(\mathrm{{FeSO}_{4}({aq})+{Zn}({s})} \) \(→ \mathrm{{ZnSO}_{4}({aq})+{Fe}({s})} \) |
Subtopic: Emf & Electrode Potential |
70%
From NCERT
NEET - 2022
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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 |
66%
From NCERT
NEET - 2022
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For the given redox reaction,
\(\mathrm{{a} {Cr}_2 {O}_7^{2-}+{bSO}_3^{2-}({aq})+{c} {H}^{+}({aq})} →\)
\(\mathrm{2 {a} {Cr}^{3+}({aq})+{bSO}_4^{2-}({aq})+\frac{{c}}{2} {H}_2 {O}(\ell)} \)
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
\(\mathrm{{a} {Cr}_2 {O}_7^{2-}+{bSO}_3^{2-}({aq})+{c} {H}^{+}({aq})} →\)
\(\mathrm{2 {a} {Cr}^{3+}({aq})+{bSO}_4^{2-}({aq})+\frac{{c}}{2} {H}_2 {O}(\ell)} \)
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 |
77%
From NCERT
NEET - 2023
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The molar conductance of a solution, given its conductivity (0.248 S m–1) and concentration (0.2 mol m–3) is:
1. 0.124 S cm2 mol–1
2. 1.24 S m2 mol–1
3. 124 S cm2 mol–1
4. 124 S m2 mol–1
1. 0.124 S cm2 mol–1
2. 1.24 S m2 mol–1
3. 124 S cm2 mol–1
4. 124 S m2 mol–1
Subtopic: Conductance & Conductivity |
From NCERT
NEET - 2023
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Which element is being reduced in the following equation?
\(\small{\begin{gathered} 3 \mathrm{Cu}(s)+8 \mathrm{HNO}_3(a q) \rightarrow 2 \mathrm{NO}(g)+3 \mathrm{Cu}\left(\mathrm{NO}_3\right)_2(a q)+4 \mathrm{H}_2 \mathrm{O}(l) \end{gathered}}\)
\(\small{\begin{gathered} 3 \mathrm{Cu}(s)+8 \mathrm{HNO}_3(a q) \rightarrow 2 \mathrm{NO}(g)+3 \mathrm{Cu}\left(\mathrm{NO}_3\right)_2(a q)+4 \mathrm{H}_2 \mathrm{O}(l) \end{gathered}}\)
| 1. | Cu | 2. | H |
| 3. | N | 4. | O |
Subtopic: Oxidizing & Reducing Agents |
85%
From NCERT
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