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Q. No.A device that converts the energy of combustion of fuels, like hydrogen and methane, directly into electrical energy is known as:
| 1. | Fuel cell. | 2. | Electrolytic cell. |
| 3. | Dynamo. | 4. | Ni-Cd cell. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen 0.1 mol MnO42– is oxidized, the quantity of electricity required to completely oxidise MnO42– to MnO4– is:
1. 96500 C
2. 2 × 96500 C
3. 9650 C
4. 96.50 C
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe weight of silver (at.wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be:
1. 5.4 g
2. 10.8 g
3. 54.0 g
4. 108.0 g
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of the electrode would be:
| 1. | 0.59 V | 2. | 0.118 V |
| 3. | 1.18 V | 4. | 0.059 V |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. 20.800%
2. 4.008%
3. 40.800%
4. 2.080%
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyZn(s) + Ag2O(s) + H2O(l) \(\rightleftharpoons\) 2Ag(s) + Zn2+(aq) + 2OH–(aq)
If half-cell potentials are-
| Zn2+(aq) + 2e–→ Zn(s) | Eo = – 0.76 V |
| Ag2O(s) + H2O(l) + 2e– → 2Ag(s) + 2OH–(aq) | Eo = 0.34 V |
The cell potential will be:
| 1. | 0.42 V | 2. | 0.84 V |
| 3. | 1.34 V | 4. | 1.10 V |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology\(\text{Mn}^{2+}+2e^-\rightarrow \text{Mn},\ E^{0}= -1.18~ \text V \)
\(\text{Mn}^{2+}\rightarrow \text{Mn}^{3+}+e^-,\ E^{0}= -1.5~ \text V \)
The \(E^{0}\) for the reaction \(\mathrm{3\ Mn^{2+}\rightarrow Mn^{0}+2Mn^{3+} }\) and possibility of the forward reaction are respectively:
| 1. | –4.18 V and Yes | 2. | +0.33 V and Yes |
| 3. | +2.69 V and No | 4. | –2.69 V and No |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology(1 Faraday = 96,500 C; Atomic mass of Co = 59 u)
| 1. | 4.0 | 2. | 20.0 |
| 3. | 40.0 | 4. | 0.66 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyLimiting molar conductivity of NH4OH (i.e., is equal to -
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe Gibb's energy for the decomposition of \(\mathrm{A l_{2} O_{3}}\) at \(\mathrm{500~ ^\circ C}\) is as follows:
2/3Al2O3 → 4/3Al + O2 ; ∆rG = + 960 k J mol–1
The potential difference needed for the electrolytic reduction of aluminium oxide (Al2O3) at \(\mathrm{500~ ^\circ C}\) is at least,
1. 3.0 V
2. 2.5 V
3. 5.0 V
4. 4.5 V
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