Electrochemistry Test

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Electrochemistry Test - 24

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Question 1
1 / -0

How many electrons flow on passing $$0.2$$ faraday of electricity?

A
$$6\times 10^{23}$$

B
$$1.2\times 10^{23}$$

C
$$3\times 10^{24}$$

D
$$1.2\times 10^{24}$$

Solution

$$1$$ Faraday is the charge carried by one mole of electrons.

$$0.2$$ Faraday = $$0.2 \times 6.023 \times 10^{23}=1.2 \times 10^{23}$$ moles of electrons.
Question 2
1 / -0

1 faraday $$=$$ _________.

A
10000 $$C$$

B
95000 $$C$$

C
96.5 $$C$$

D
96500 $$C$$

Solution

Charge of one mole of electrons is known as one faraday which is equal to 96,500 coulombs.
Question 3
1 / -0

Identify the false statement among the following:

A
Oxidation takes place at positive electrode in electrolytic cell whereas at negative electrode in voltaic cell

B
Deposition of metals takes place in both electrolytic cell and galvanic cell

C
Direction of flow of current is from cathode to anode in electrolytic cell

D
Both $$A$$ and $$B$$

Solution

Oxidation takes place at anode and reduction at cathode. In electrolytic cell anode is positive and anode positive. In voltaic cell , anode is negative.
Metal deposition takes place in electrolytic cell only.
Direction of current is always cathode to anode in electrolytic cell.
therefore statement B is false
B is correct option
Question 4
1 / -0

To protect iron from corrosion and rust, it is coated by :

A
Tin

B
Copper

C
Zinc

D
Mercury

Solution

To protect the iron from corrosion and rust, it is coated with zinc. Rusting of iron is an oxidation process in which iron gets oxidized in the presence of air and moisture for a long period of time. It is protected by applying a coat of zinc. The zinc protects iron by corroding first, i.e zinc oxidizes before iron metal thus preventing it from rusting.

Therefore, option C is correct.
Question 5
1 / -0

The secondary battery is such a battery:

A
which cannot be recharged

B
which can be recharged

C
which can be reused after replacing its chemical

D
which is charged by primary cells

Solution

A secondary battery cell is one in which chemical energy is converted into electrical energy, but they work only when they are charged by passing electric current through them by some source.
Question 6
1 / -0

Primary battery is a battery:

A
which can be recharged.

B
which cannot be reconditioned by replacing chemical.

C
which cannot be reused.

D
which cannot be recharged.

Solution

Primary cells:
It is an electrochemical cell which acts as a source of electrical energy without being previously charged up by an electric current from an external source of current.
In which electrode reactions cannot be reversed by an external source.
These are not chargeable.
Question 7
1 / -0

The quantity of electricity needed to liberate $$0.5\ gram$$ equivalent of an element is

A
$$48250\ faraday$$

B
$$48250\ coulomb$$

C
$$19300\ faraday$$

D
$$19300\ coulomb$$

Solution

Electricity required, $$Q=$$ No. of equiv. $$\times $$ 96500 coulombs

$$=0.5\times 96500=48250\ C$$
Question 8
1 / -0

Metals react differently with water. The more vigorous is the reaction, the more is the bubble formation. The following diagram illustrates the reaction of sodium, magnesium and copper with water.
What can be concluded from this diagram?

A
Magnesium reacts more vigorously with water than sodium and copper.

B
Sodium reacts more vigorously with water than magnesium and copper.

C
Sodium reacts more vigorously than copper but less vigorously than magnesium.

D
Copper reacts more vigorously with water than sodium and magnesium.

Solution

Sodium reacts more vigorously with water than magnesium and copper.
Question 9
1 / -0

Which of the following statements are true?

A
During electrolysis, charge flows through electrolytic solution via electrons.

B
The randomly moving electrons in a metal wire will start moving in a particular direction when a potential difference is applied across it.

C
A negatively charged particle has higher electric potential than a positively charged particle.

D
Charge flows only through negative charge carriers like electrons.

Solution

A. False
During electrolysis positively and negatively both charged ions move in solution to constitute a charge.
B. True
When a potential difference is applied to randomly moving electrons, they experience force opposite to the direction of the electric field due to the potential. Hence, they start moving in the same direction.
C. False
Electric Potential of a particle depends on the amount of charge on the particle. Positive or negative value of potential is due to the movement of the particle in or against the electric field.
D. False
Charge flows through both positive and negative charge carriers. For example:- In electrolysis, positively charged ions migrate to a cathode and negatively charged ions move to an anode.
Question 10
1 / -0

The capacity of cell is measured in:

A
amperes

B
ampere-hour

C
watts

D
watt-hours

Solution

The capacity of a cell is measured by the discharging at a constant electric current until it fully drains out for that particular time. Hence, the capacity of the cell/battery is measured by the ampere-hour rating.

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Electrochemistry Test - 24

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Electrochemistry Test - 24

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SHARING IS CARING

Question 1

$$6\times 10^{23}$$

$$1.2\times 10^{23}$$

$$3\times 10^{24}$$

$$1.2\times 10^{24}$$

Solution

Question 2

10000 $$C$$

95000 $$C$$

96.5 $$C$$

96500 $$C$$

Solution

Question 3

Oxidation takes place at positive electrode in electrolytic cell whereas at negative electrode in voltaic cell

Deposition of metals takes place in both electrolytic cell and galvanic cell

Direction of flow of current is from cathode to anode in electrolytic cell

Both $$A$$ and $$B$$

Solution

Question 4

Tin

Copper

Zinc

Mercury

Solution

Question 5

which cannot be recharged

which can be recharged

which can be reused after replacing its chemical

which is charged by primary cells

Solution

Question 6

which can be recharged.

which cannot be reconditioned by replacing chemical.

which cannot be reused.

which cannot be recharged.

Solution

Question 7

$$48250\ faraday$$

$$48250\ coulomb$$

$$19300\ faraday$$

$$19300\ coulomb$$

Solution

Question 8

Magnesium reacts more vigorously with water than sodium and copper.

Sodium reacts more vigorously with water than magnesium and copper.

Sodium reacts more vigorously than copper but less vigorously than magnesium.

Copper reacts more vigorously with water than sodium and magnesium.

Solution

Question 9

During electrolysis, charge flows through electrolytic solution via electrons.

The randomly moving electrons in a metal wire will start moving in a particular direction when a potential difference is applied across it.

A negatively charged particle has higher electric potential than a positively charged particle.

Charge flows only through negative charge carriers like electrons.

Solution

Question 10

amperes

ampere-hour

watts

watt-hours

Solution

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