Electrochemistry test 6

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A test from chapter 10 i.e Electrochemistry of Chemistry part 1. This is Free online test for FSc and Entry test Preparation for UET, NUST, FAST, GIKI, PIEAS, NFC, Punjab University, UHS, other Engineering Universities and Medical Colleges.

1. Which one of the following will be good conductor of electricity

A) pure distilled water
B) molten Nacl
C) dilute solution of glucose
D) chloroform

2. Which one of the following represents the same net reaction as the electrolysis of aqueous H2SO4

A) electrolysis of water
B) electrolysis of molten NaCl
C) electrolysis of aqueous HCl
D) electrolysis of aqueous NaCl

3. In a galvanic cell, the reaction occurs 2H2O ( O2 (g) + 4H+ + 4e– It occurs at the

A) cathode
B) anode
C) both
D) none

4. Which statement below is not true for the reaction Fe3+ + e– ( Fe2+

A) Fe3+ is reduced
B) oxidation state of Fe has changed
C) Fe3+ can act as an oxidizing agent
D) both Fe2+ and Fe3+ are called anions

5. During a redox reaction, an oxidizing agent

A) gains electrons
B) is oxidized
C) loses electrons
D) is hydrolysed

6. In a salt bridge KCl is used because

A) it is an electrolyte
B) K+ and Cl- transfer easily
C) agar-agar forms a good jelly with it
D) KCl is also present in the calomel electrode

7. A oxidizing agent is a substance which brings about

A) electron donation
B) oxidation
C) reduction
D) hydrolysis

8. In the electrolysis the process of oxidation occurs at

A) anode
B) cathode
C) both
D) in electrolytic solution

9. In an oxidation process the oxidation number of the element

A) increases
B) decreases
C) doesn't change
D) none

10. In the reduction process the oxidation number of the element

A) increases
B) decreases
C) doesn't change
D) none