| 1 |
The electrode reaction of a voltaic cell can be reversed when |
- A. Concentrations of solutions are changed
- B. Temperature is increased
- C. Electrodes are interchanged
- D. Electric circuit is employed to supply the source of electricity
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| 2 |
Oxidation number of carbon in NaHCO<sub>3</sub> |
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| 3 |
During the electrolysis of molten NaCI, the ion which is reduce is |
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| 4 |
In which compound the oxidation number of Mw is +6 |
- A. KMnO4
- B. K2MnO4
- C. MnO2
- D. MnO
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| 5 |
In the reaction 2Fe+3Cl2 ------------ FeCl2 |
- A. Fe is reduced
- B. Fe is oxidized
- C. Cl2 is oxidized
- D. None of these happens
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| 6 |
Fuel cells are mostly used in space air crafts as the source of. |
- A. Power only
- B. Drinking water
- C. Drinking water and power
- D. Fuel and drinking water
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| 7 |
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- A. Fe is reduced
- B. Fe is oxidized
- C. CI<sub>2</sub>is oxidized
- D. None of these
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| 8 |
The cathodic reaction in the electrolysis of dill. H<sub>2</sub>SO<sub>4</sub>with Pt electrodes is |
- A. Reduction
- B. Oxidation
- C. Both oxidation and reduction
- D. Neither oxidation nor reduction
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| 9 |
In given equation underlined element is. P+HNO3------------- H2PO4+NO+H2O |
- A. Oxidized
- B. Reduced
- C. Neither oxidized nor reduced
- D. Botha a and b
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| 10 |
Oxidation number of Cr in a C<sub>2</sub>CrO<sub>4</sub> is |
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