Electrochemistry Test

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Electrochemistry Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

The electric charge for electrode deposition of 1gm. Equivalent of a substance is:

A
96,500 coulombs

B
one ampere per sec

C
one ampere for one hour

D
charge in faradays

Solution

According to Faraday's laws, for deposition of 1 gm of an equivalent weight of a substance, amount of charge required is equal to the charge on one mole of electrons.
i.e., the Electric charge required = Electric charge on one mole of electrons
= Charge on one electron x Avagadro's number
= $$1.6\times 10^{-19}\times 6.023\times 10^{23}$$
= 96500 C/mol
Question 2
1 / -0

The EMF of a galvanic cell is determined by using a:

A
voltmeter

B
potentiometer

C
coulometer

D
ammeter

Solution

EMF is measured by using a voltmeter while standard EMF by a potentiometer.
Question 3
1 / -0

For the cell reaction to be spontaneous the EMF of the cell should be:

A
negative

B
positive

C
zero

D
some times positive and some times negative

Solution

If EMF of cell is positive, then the $$\Delta$$ G of the overall reaction is less than zero.
$$\Delta G=-nF E_{cell}$$
$$\therefore$$ If $$E_{cell}$$ is positive, then reaction is spontaneous
Hence, option B is correct.
Question 4
1 / -0

Zinc corrodes in ____________________.

A
$$2M$$ alkaline solution

B
$$2M$$ acid solution

C
$$2M$$ neutral salt solution

D
all of the above

Solution

Corrosion requires an acidic medium. Hence zinc corrodes in $$2M$$ acid solution.

Hence, option B is correct.
Question 5
1 / -0

In an electrolytic cell cathode acts as:

A
an oxidizing agent

B
reducing agent

C
either of the two

D
neither of the two

Solution

At cathode reduction occurs, therefore, cathode acts as a reducing agent by supplying electrons.

Hence, option B is correct.
Question 6
1 / -0

Anode in the galvanic cell is :

A
Negative electrode

B
Positive electrode

C
Neutral electrode

D
None of the above

Solution

Electrochemical cells or galvanic cells are same thing. Anode in galvanic cells is negative electrode where oxidation takes place.
Question 7
1 / -0

Electric energy is produced by the :

A
separation of charges

B
separation of protons

C
separation of holes

D
separation of plates

Solution

Electric energy is a form of energy, which is created by the movement of electrons. Generally electrons are bound to an atom by the positive force of protons. When for some reason these electrons get detached from their atoms electric energy is produced.
Question 8
1 / -0

_________ is an application of electrolysis.

A
Oxidation

B
Electrotyping

C
Electric shielding

D
Electric polishing.

Solution

Electrotyping is one of application of electrolysis, and is used for the reproduction of some craft work e.g., art work on metals, woodcarving and gramophone records etc.
An impression of the object is taken on a wax block. The wax blocks impression is then coated (sprayed) with a fine power of graphite and is made cathode in an electrolytic bath containing solution of a suitable salt e.g., copper sulfate.
The anode is made of a thin sheet of pure metal e.g., copper metal. The passage of electric current results in the deposition of copper on the wax block impression. After a reasonably thick layer of metal is obtained, the wax is removed by melting. The metallic impression so obtained can be used for obtaining its copies on paper or on plastics.
Question 9
1 / -0

Which of the following methods is suitable for preventing an iron frying pan from rusting?

A
Applying grease

B
Applying paint

C
Applying a coating of zinc

D
All of the above.

Solution

We can prevent iron getting rusted by applying a coat of zinc or a thin coat of plastic helps to prevent rust. The process for coating metal like iron or steel with a thin zinc layer is known as galvanization.
Question 10
1 / -0

Splitting a compound using electricity is called:

A
electrolysis

B
electrolyte

C
electrokinesis

D
none of the above

Solution

Ionic substances can be broken down into the elements they are made from by passing electricity through them. The process is called electrolysis.

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Electrochemistry Test - 13

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Electrochemistry Test - 13

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Question 1

96,500 coulombs

one ampere per sec

one ampere for one hour

charge in faradays

Solution

Question 2

voltmeter

potentiometer

coulometer

ammeter

Solution

Question 3

negative

positive

zero

some times positive and some times negative

Solution

Question 4

$$2M$$ alkaline solution

$$2M$$ acid solution

$$2M$$ neutral salt solution

all of the above

Solution

Question 5

an oxidizing agent

reducing agent

either of the two

neither of the two

Solution

Question 6

Negative electrode

Positive electrode

Neutral electrode

None of the above

Solution

Question 7

separation of charges

separation of protons

separation of holes

separation of plates

Solution

Question 8

Oxidation

Electrotyping

Electric shielding

Electric polishing.

Solution

Question 9

Applying grease

Applying paint

Applying a coating of zinc

All of the above.

Solution

Question 10

electrolysis

electrolyte

electrokinesis

none of the above

Solution

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