Electrochemistry Test

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Electrochemistry Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is correct about an electrolytic cell?

A
It is a device which converts chemical energy into electrical energy.

B
The redox reaction in this case is spontaneous.

C
Electrons are supplied by external battery.

D
In this case, anode is negative and cathode is positive.

Solution

The electrons are supplied by external battery, and enter through the cathode and come out through the anode.
Question 2
1 / -0

On passing electric current, the quantity of deposition of a metal on cathode depends on the

A
shape of electrodes

B
size of electrodes

C
concentration of electrolytic solution

D
quantity of electric charge that passes through the solution

Solution

According to Faraday's law, the amount of any substance deposited or liberated during electrolysis is proportional to the quantity of electric charge passed and to the equivalent weight of the substance.
Question 3
1 / -0

Which of the following metals forms a protective layer of oxide to prevent corrosion?

A
Cu

B
Ag

C
Au

D
Al

Solution

Aluminium spontaneously forms a thin, but effective oxide layer that prevents further oxidation. Aluminium oxide is impermeable and, unlike the oxide layers on many other metals, it adheres strongly to the parent metal. If damaged mechanically, aluminium's oxide layer repairs itself immediately.
Question 4
1 / -0

Which of the following solutions is used as an anti-rusting solution?

A
Na₂SO₄

B
Na₃PO₄

C
Na₃BO₃

D
Na₂S

Solution

Na₃PO₄is used as an anti-rusting solution.
Question 5
1 / -0

Corrosion of iron may be prevented by

A
covering the surface of iron with metallic nickel by electroplating

B
keeping the surface of iron wet

C
keeping a copper block in contact with iron

D
keeping iron immersed in brine

Solution

Iron corrodes when it is in contact with air and moisture for. Presence of electrolytes like salt in water increases the rate of corrosion. Iron objects are electroplated with Nickel, which prevents iron it from coming in contact with these and Nickel itself does not corrode in air or moisture.

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Electrochemistry Test - 8

Result

Electrochemistry Test - 8

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SHARING IS CARING

Question 1

It is a device which converts chemical energy into electrical energy.

The redox reaction in this case is spontaneous.

Electrons are supplied by external battery.

In this case, anode is negative and cathode is positive.

Solution

Question 2

shape of electrodes

size of electrodes

concentration of electrolytic solution

quantity of electric charge that passes through the solution

Solution

Question 3

Cu

Ag

Au

Al

Solution

Question 4

Na2SO4

Na3PO4

Na3BO3

Na2S

Solution

Question 5

covering the surface of iron with metallic nickel by electroplating

keeping the surface of iron wet

keeping a copper block in contact with iron

keeping iron immersed in brine

Solution

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Na₂SO₄

Na₃PO₄

Na₃BO₃

Na₂S