| 1 |
Copper extracted from its ore is ____________ % pure. |
- A. 98%
- B. 99%
- C. 96%
- D. Nil
|
| 2 |
Oxidation means |
- A. Gain of oxygen
- B. Removal of oxygen
- C. Gain of hydrogen
- D. Gain of electrons
|
| 3 |
Nelson's cells used to prepare caustic soda along with gases. Which of the following gas is produced at cathode?<br> |
- A. CI<sub>2</sub>
- B. H<sub>2</sub>
- C. O<sub>3</sub>
- D. O<sub>2</sub>
|
| 4 |
Addition of OXYGEN is called. |
- A. Reduction
- B. Conduction
- C. Oxidation
- D. Nil
|
| 5 |
The metallic plates through which electrons enters and leaves electrolytes: |
- A. Wires
- B. Electrodes
- C. Both
- D. Nil
|
| 6 |
Metals are covered by using. |
- A. Baeyer's test
- B. Bohr's
- C. Electrolysis
- D. None
|
| 7 |
Which one is not a property of electrolytic cell? |
- A. It consists of one complete cell
- B. Anode has +ve charge
- C. It converts electrical energy into chemical one
- D. Anode has -ve charge
|
| 8 |
Gain of electrons in a reaction is called ____________reaction. |
- A. Oxidation
- B. Reduction
- C. Both
- D. Nil
|
| 9 |
CO2 the oxidation number of C =. |
|
| 10 |
Which is used for industrial manufacture of NaCI? |
- A. Daniel cell
- B. Down's cell
- C. Nelson's cell
- D. None of these
|
