Redox and Electrochemistry Test

Result

Redox and Electrochemistry Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

In dry cell which metal is used for anode?

A
Zinc

B
graphite

C
carbon rod

D
none of these

Solution

The container of the dry cell is made of zinc which also serves as one of the electrodes. Anode reaction: Zn →Zn²⁺ + 2e^-
Question 2
1 / -0

In acidic medium, MnO₄^– is converted to Mn⁺² when acts as an oxidizing agent. The quantity of electricity required to reduce 0.05 mol of MnO₄^– would be

A
0.01F

B
0.05F

C
0.25 F

D
0.15 F

Solution

MnO₄^– + 8H⁺ + 5e^– → Mn⁺² + 4H₂O

1 mol 5 mole

1 mole MnO₄^– required = 5 mole e^–

so 0.05 MnO₄^– required = 5 × 0.05

= 0.25

1 mole e^– required = 1 F

So 0.25 required = 0.25 × F

= 0.25 F
Question 3
1 / -0

The process of applying an electric current through a cell to produce a chemical change is called:

A
corrosion.

B
ionization.

C
hydrolysis.

D
electrolysis.

Solution

Electrolysis is the process of application of electrical energy through cell to produce a chemical change.

Corrosion is process od conversion of metal into its more stable oxide, hydroxide or sulphide.

Hydrolysis is the addition of water to some substance.
Question 4
1 / -0

Anode of dry cell is made of?

A
Calcium

B
Sodium

C
Zinc

D
None of these

Solution

Anode of dry cell is made of zinc metal.