| 1 |
CO2 the oxidation number of C =. |
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| 2 |
In peroxides, the oxidation no. of O is |
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| 3 |
It is a strong electrolyte |
- A. H2O
- B. CH3COOH
- C. NaOH
- D. C6H6
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| 4 |
Copper extracted from its ore is ____________ % pure. |
- A. 98%
- B. 99%
- C. 96%
- D. Nil
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| 5 |
____________ agents gains electrons in chemical reaction. |
- A. Reduction
- B. Oxidation
- C. Both
- D. None of these
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| 6 |
____________ of copper is done by electrolysis. |
- A. Production
- B. Refining
- C. Both
- D. Nil
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| 7 |
Gases produced in Nelson's cell are:<br> |
- A. H<sub>2</sub> and O<sub>2</sub>
- B. H<sub>2</sub> and CI<sub>2</sub><br>
- C. H<sub>2</sub> and N<sub>2</sub><br>
- D. CI<sub>2</sub> and O<sub>2</sub><br>
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| 8 |
The oxidation number of chromium in K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> is:<br> |
- A. +2<br>
- B. +6<br>
- C. +7<br>
- D. +14<br>
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| 9 |
____________ is prevented by Metallic coating. |
- A. NaCl
- B. Rust
- C. All
- D. None of these
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| 10 |
Reduction means |
- A. Removal of H2
- B. Removal of electrons
- C. Gain of electrons
- D. Gain of O2
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