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Q. No.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | In equation \(\Delta_{\mathrm{r}} \mathrm{G}=-\mathrm{nFE} _{\text {cell }}, \) value \(\Delta_rG \) depends on n. |
| Reason (R): | \(E_{cell} \) is an intensive property and \(\Delta_rG \) is an extensive property. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | (A) is false but (R) is true. |
| 2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are true and (R) is NOT the correct explanation of (A). |
| 4. | (A) is true but (R) is false. |
Subtopic: Relation between Emf, G, Kc & pH |
55%
From NCERT
NEET - 2023
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The conductivity of centimolar solution of KCl at 25°C is 0.0210 ohm-1 cm-1 and the resistance of the cell containing the solution at 25°C is 60 ohm. The value of cell constant is-
| 1. | 3.34 cm-1 | 2. | 1.34 cm-1 |
| 3. | 3.28 cm-1 | 4. | 1.26 cm-1 |
Subtopic: Conductance & Conductivity |
73%
From NCERT
NEET - 2023
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Molar conductance of an electrolyte increase with dilution according to the equation:
\(\Lambda_{\mathrm{m}}=\Lambda_{\mathrm{m}}^{\circ}-\mathrm{A} \sqrt{\mathrm{c}} \)
Which of the following statements is true?
Choose the most appropriate answer from the options given below:
1. (A) and (B) only
2. (A), (B), and (C) only
3. (B) and (C) only
4. (B) and (D) only
\(\Lambda_{\mathrm{m}}=\Lambda_{\mathrm{m}}^{\circ}-\mathrm{A} \sqrt{\mathrm{c}} \)
Which of the following statements is true?
| A. | This equation applies to both strong and weak electrolytes |
| B. | Value of the constant A depends upon the nature of the solvent |
| C. | Value of constant A is the same for both \(BaCl_2\) and \(MgSO_4\) |
| D. | Value of constant A is the same for both \(BaCl_2\) and \(Mg(OH)_2\) |
Choose the most appropriate answer from the options given below:
1. (A) and (B) only
2. (A), (B), and (C) only
3. (B) and (C) only
4. (B) and (D) only
Subtopic: Conductance & Conductivity |
50%
From NCERT
NEET - 2023
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The correct value of cell potential in volt for the reaction that occurs when the following two half cells are connected, is:
\(\mathrm{Fe}_{\text {(aq) }}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Fe}(\mathrm{s}), \mathrm{E}^{\circ}=-0.44 \mathrm{~V} \)
\( \mathrm{Cr}_2 \mathrm{O}_7^{2-}{ }_{\text {(aq) }}+14 \mathrm{H}^{+}+6 e^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O},\)
\( \mathrm{E}^{\circ}=+1.33 \mathrm{~V}\)
\(\mathrm{Fe}_{\text {(aq) }}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Fe}(\mathrm{s}), \mathrm{E}^{\circ}=-0.44 \mathrm{~V} \)
\( \mathrm{Cr}_2 \mathrm{O}_7^{2-}{ }_{\text {(aq) }}+14 \mathrm{H}^{+}+6 e^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O},\)
\( \mathrm{E}^{\circ}=+1.33 \mathrm{~V}\)
| 1. | +1.77 V | 2. | +2.65 V |
| 3. | +0.01 V | 4. | +0.89 V |
Subtopic: Electrode & Electrode Potential |
71%
From NCERT
NEET - 2023
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Given below are half-cell reactions:
\(\mathrm{MnO}_{4}^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_{2} \mathrm{O}, \)
\( \mathrm{E}_{\mathrm{Mn}^{2+}}^{\circ} / \mathrm{MnO}_{4}^{-}=-1.510 \mathrm{~V} \)
\( \frac{1}{2} \mathrm{O}_{2}+2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2} \mathrm{O}, \)
\( \mathrm{E}_{\mathrm{O}_{2} / \mathrm{H}_{2} \mathrm{O}}^{\circ}=+1.223 \mathrm{~V}\)
Will the permanganate ion, \(\mathrm{MnO}_{4}^{-}\) , liberate \(\mathrm{O}_{2}\) from water in the presence of an acid?
1. No, because \(\mathrm{E}_{\text {cell }}^{\circ}=-2.733 \mathrm{~V}\)
2. Yes, because \(\mathrm{E}_{\text {cell }}^{\circ}=+0.287 \mathrm{~V}\)
3. No, because \(\mathrm{E}_{\text {cell }}^{\circ}=-0.287 \mathrm{~V}\)
4. Yes, because \(\mathrm{E}_{\text {cell }}^{\circ}=+2.733 \mathrm{~V}\)
\(\mathrm{MnO}_{4}^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_{2} \mathrm{O}, \)
\( \mathrm{E}_{\mathrm{Mn}^{2+}}^{\circ} / \mathrm{MnO}_{4}^{-}=-1.510 \mathrm{~V} \)
\( \frac{1}{2} \mathrm{O}_{2}+2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2} \mathrm{O}, \)
\( \mathrm{E}_{\mathrm{O}_{2} / \mathrm{H}_{2} \mathrm{O}}^{\circ}=+1.223 \mathrm{~V}\)
Will the permanganate ion, \(\mathrm{MnO}_{4}^{-}\) , liberate \(\mathrm{O}_{2}\) from water in the presence of an acid?
1. No, because \(\mathrm{E}_{\text {cell }}^{\circ}=-2.733 \mathrm{~V}\)
2. Yes, because \(\mathrm{E}_{\text {cell }}^{\circ}=+0.287 \mathrm{~V}\)
3. No, because \(\mathrm{E}_{\text {cell }}^{\circ}=-0.287 \mathrm{~V}\)
4. Yes, because \(\mathrm{E}_{\text {cell }}^{\circ}=+2.733 \mathrm{~V}\)
Subtopic: Electrode & Electrode Potential |
From NCERT
NEET - 2022
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Find the emf of the cell in which the following reaction takes place at 298 K:
\(\mathrm{Ni}(\mathrm{s})+2 \mathrm{Ag}^{+}(0.001 \mathrm{M}) \rightarrow \mathrm{Ni}^{2+}(0.001 \mathrm{M})+2 \mathrm{Ag}(\mathrm{s}) \)
\( \small{\text { (Given that } \mathrm{E}_{\text {cell }}^{\circ}=10.5 \mathrm{~V}, \frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059 \text { at } \ 298 \mathrm{~K})} \)
1. 1.05 V
2. 1.0385 V
3. 1.385 V
4. 0.9615 V
Subtopic: Nernst Equation |
From NCERT
NEET - 2022
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The three cells with their \(E^\circ_{\text{(cell)}}\) values are given below:
| Cells | \(E^\circ_{\text{(cell)}}/V\) | |
| (a) | Fe|Fe2+||Fe3+|Fe | 0.404 |
| (b) | Fe|Fe2+||Fe3+, Fe2+|Pt | 1.211 |
| (c) | Fe|Fe3+||Fe3+, Fe2+|Pt | 0.807 |
(F represents the charge on 1 mole of electrons.)
| 1. | -1.212 F, -1.211 F, -0.807 F |
| 2. | +2.424 F, +2.422 F, +2.421 F |
| 3. | -0.808 F, -2.422 F, -2.421 F |
| 4. | -2.424 F, -2.422 F, -2.421 F |
Subtopic: Faraday’s Law of Electrolysis |
54%
From NCERT
NEET - 2022
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\(\land^o_m\) for NaCl, HCl and \(CH_3COONa \) are 126.4, 425.9, and 91.05 S cm2 mol-1 respectively. If the conductivity of 0.001028 mol L-1 acetic acid solution is \(4.95 \times 10^{-5} S ~cm^{-1} \), the degree of dissociation of the acetic acid solution is-
| 1. | 0.01233 | 2. | 1.00 |
| 3. | 0.1233 | 4. | 1.233 |
Subtopic: Conductance & Conductivity |
56%
From NCERT
NEET - 2022
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Two half cell reactions are given below:
\(\begin{aligned} &\mathrm{Co}^{3+}+e^{-} \rightarrow \mathrm{Co}^{2+}, \mathrm{E}_{\mathrm{Co}^{2+} / \mathrm{Co}^{3+}}^{\circ}=-1.81 \mathrm{~V} \\ &2 \mathrm{Al}^{3+}+6 e^{-} \rightarrow 2 \mathrm{Al}(\mathrm{s}), \mathrm{E}_{\mathrm{Al} / \mathrm{Al}^{3+}}^{\circ}=+1.66 \mathrm{~V} \end{aligned} \)
The standard EMF of a cell with feasible redox reaction will be:
| 1. | +7.09 V | 2. | +0.15 V |
| 3. | +3.47 V | 4. | –3.47 V |
Subtopic: Electrode & Electrode Potential |
64%
From NCERT
NEET - 2022
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Standard electrode potential for the cell with cell reaction
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
is 1.1 V. Calculate the standard Gibbs energy change for the cell reaction.
(Given F = 96487 C mol-1)
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
is 1.1 V. Calculate the standard Gibbs energy change for the cell reaction.
(Given F = 96487 C mol-1)
| 1. | -200.27 kJ mol-1 | 2. | -212.27 kJ mol-1 |
| 3. | -212.27 J mol-1 | 4. | -200.27 J mol-1 |
Subtopic: Relation between Emf, G, Kc & pH |
80%
From NCERT
NEET - 2022
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NEET 2021 - Achiever Batch - Aryan Raj Singh
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