2nd Year Chemistry Chapter 2 Test02. Electrochemistry

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Reduction is defined as:
   1. Loss of protons
   2. Gain of electrons
   3. Loss of neutrons
   4. Loss of electrons
2. In a redox reaction, the oxidizing agent:
   1. Loses electrons
   2. Gains electrons
   3. Loses protons
   4. Gains protons
3. An electrolytic cell converts:
   1. Heat into electricity
   2. Chemical energy into electrical energy
   3. Electrical energy into chemical energy
   4. Light into electricity
4. Metals higher in the activity series are:
   1. Easily reduced
   2. Easily oxidized
   3. Noble metals
   4. Non-reactive
5. In the reaction: 2Na+Cl2→2NaCl The oxidation number of Na changes from:
   1. 0 to +1
   2. +1 to 0
   3. 0 to –1
   4. +1 to –1
6. Which of the following elements is reduced in the reaction? 2Na + Cl₂ → 2NaCl
   1. Na
   2. Cl
   3. Both Na and Cl
   4. Neither Na nor Cl
7. The oxidizing agent in the reaction CuO + H₂ → Cu + H₂O is:
   1. CuO
   2. H₂
   3. Cu
   4. H₂O
8. An oxidizing agent is a substance that:
   1. Donates protons
   2. Accepts electrons
   3. Loses electrons
   4. Releases neutrons
9. The time for which current is passed in the experiment is:
   1. 60 seconds
   2. 600 seconds
   3. 1800 seconds
   4. 3600 seconds
10. The salt bridge in a galvanic cell:
    1. Provides electrons
    2. Prevents mixing of solutions
    3. Maintains electrical neutrality
    4. Acts as a catalyst