Electrochemistry Test

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Electrochemistry Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

One Faraday is equal to ___________.

A
69500 coulombs

B
91500 coulombs

C
91400 coulombs

D
96500 coulombs

Solution

The Faraday constant (named after Michael Faraday) is the magnitude of electric charge per mole of electrons. It is equal to 96500 coulombs.
Question 2
1 / -0

In electrochemical cell, oxidation and reduction occurs at:

A
anode and cathode respectively

B
cathode and anode respectively

C
electrode

D
anode only

Solution

Oxidation occurs at the electrode termed the anode and reduction occurs at the electrode called the cathode.
In both galvanic and electrolytic cells, oxidation takes place at the anode and electrons flow from the anode to the cathode. and reduction takes place at cathode.
The anode of an electrolytic cell is positive (cathode is negative), since the anode attracts anions from the solution.
Question 3
1 / -0

Faraday's laws are consequence of conservation of

A
energy

B
energy and magnetic field

C
charge

D
magnetic field

Solution

Hint: Faraday's law converts mechanical energy to electrical energy.
Explanation:

According to Faraday’s law, the induced voltage in a circuit is proportional to the magnetic flux through the circuit's rate of change over time.
The Law of conservation of energy states that energy can neither be created nor be destroyed but it can convert into one form to another.
Faraday's law involves the conservation of mechanical energy into electrical energy and it is in accordance with the law of conservation of energy.

Correct Option: $$A$$
Question 4
1 / -0

Lithium cell comes under category of :

A
disposable battery

B
lithium battery

C
lead acid battery

D
non-disposable battery

Solution
Question 5
1 / -0

In the rusting of iron, iron has been:

A
oxidised

B
reduced

C
vaporised

D
decomposed

Solution

In corrosion, metal is oxidised by loss of electrons to oxygen to form metal oxide. In rusting of iron, at one spot of the iron object oxidation occurs and that spot behaves as an anode.
Anode: $$Fe(s) → Fe^{2+}(aq) + 2e^- $$
Cathode: $$4e^- + 4H^+(aq) + O_2(aq) → 2H_2O(l)$$
Question 6
1 / -0

Voltaic cell is same as:

A
galvanic cell

B
electrolytic cell

C
fuel cell

D
lead cell

Solution

Electrolytic cell, voltaic cell or galvanic cell is an electrochemical cell that derives electrical energy from redox reactions taking place in the cell.
Question 7
1 / -0

The U shaped vessel used in Nelson cell is lined inside with asbestos which:

A
helps in the separation of cathode and anode compartments.

B
acts as an insulator.

C
helps $$H^{+}$$ ions to reduced to $$H_{2}$$ gas.

D
allows the dissociation of steam.

Solution

The diaphragm is made of a porous mixture of asbestos and polymers. The diaphragm and membrane cells are designed so that all the products are kept separate as asbestos does not react with NaOH.
Question 8
1 / -0

The presence of $$CO_2$$ in the atmosphere results in:

A
rusting.

B
dusting.

C
electroplating.

D
freezing.

Solution

The presence of $$CO_2$$ in the atmosphere will do iron oxide rusting. When a drop of water hits an iron object, two things begin to happen almost immediately.
First, the water, a good electrolyte, combines with carbon dioxide in the air to form a weak carbonic acid, an even better electrolyte. As the acid is formed and the iron dissolved, some of the water will begin to break down into its component pieces - hydrogen and oxygen.
The free oxygen and dissolved iron bond into iron oxide, in the process freeing electrons.
Question 9
1 / -0

Identify the correct relation among the following for $$m$$ gm of substance deposited, for the passage of $$c$$ ampere current through the electrolyte for $$t$$ seconds.

A
$$m= \dfrac{z}{ct}$$

B
$$m= \dfrac{zt}{c}$$

C
$$m=\dfrac{ct}{z}$$

D
$$m=zct$$

Solution

Faraday's 1st Law of Electrolysis - The mass of a substance altered at an electrode during electrolysis is directly proportional to the quantity of electricity transferred at that electrode. Thus, m= $$Z\times c\times t$$, where $$Z$$ is the electrochemical equivalent.
Question 10
1 / -0

In a galvanic cell, electrons flow through connecting wires from:

A
anode to cathode

B
cathode to anode

C
top to bottom

D
anode

Solution

In a galvanic cell, oxidation occurs at anode and reduction occurs at the cathode i.e., electrons are released from anode and they are accepted at the cathode. Hence, electrons flow from anode to cathode in a galvanic cell.

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Electrochemistry Test - 23

Result

Electrochemistry Test - 23

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SHARING IS CARING

Question 1

69500 coulombs

91500 coulombs

91400 coulombs

96500 coulombs

Solution

Question 2

anode and cathode respectively

cathode and anode respectively

electrode

anode only

Solution

Question 3

energy

energy and magnetic field

charge

magnetic field

Solution

Question 4

disposable battery

lithium battery

lead acid battery

non-disposable battery

Solution

Question 5

oxidised

reduced

vaporised

decomposed

Solution

Question 6

galvanic cell

electrolytic cell

fuel cell

lead cell

Solution

Question 7

helps in the separation of cathode and anode compartments.

acts as an insulator.

helps $$H^{+}$$ ions to reduced to $$H_{2}$$ gas.

allows the dissociation of steam.

Solution

Question 8

rusting.

dusting.

electroplating.

freezing.

Solution

Question 9

$$m= \dfrac{z}{ct}$$

$$m= \dfrac{zt}{c}$$

$$m=\dfrac{ct}{z}$$

$$m=zct$$

Solution

Question 10

anode to cathode

cathode to anode

top to bottom

anode

Solution

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