Electrochemistry Test

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Electrochemistry Test - 33

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Weekly Quiz Competition

Question 1
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

Applying paint and grease are not suitable solutions to prevent an iron frying pan from rusting as the paint can melt by flame and can be destroyed in repeated use.
Applying a coating of zinc is a better option as it forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal.
Question 2
1 / -0

The decomposition of chemical compound in the aqueous or fused state by passing direct electric current is known as :

A
electricity

B
electrolyte

C
electrolysis

D
non-electrolysis

Solution

The decomposition of chemical compound in the aqueous or fused state by passing direct electric current is known as electrolysis.
Question 3
1 / -0

Chemical compounds which conduct electricity in the fused or in aqueous solution state and undergo chemical decomposition due to the flow of current through it are known as :

A
electrolytes

B
non-electrolytes

C
weak electrolytes

D
all of the above

Solution

Chemical compounds which conduct electricity in the fused or in aqueous solution state and undergo chemical decomposition due to the flow of current through it are known as electrolytes. e.g $$NaCl$$
Question 4
1 / -0

Which of the following is an example of strong electrolyte?

A
$$HCl_{(aq)}\rightarrow H^{+}+Cl^{-}$$

B
$$KOH\rightarrow K^{+}+OH^{-}$$

C
$$AgNO_3\rightarrow Ag^{+}+NO_3\,^{-}$$

D
all of the above

Solution

Strong electrolytes are the electrons which dissociate completely in aqueous solution. $$HCl,\ AgNO_3,\ KOH$$ are the examples of strong electrolytes.
Question 5
1 / -0

Which of the following statement is correct?

A
$$E_{cell}$$ and $$\triangle_{r}G$$ of cell reaction both are extensive properties

B
$$E_{cell}$$ and $$\triangle_{r}G$$ of cell reaction both are intensive properties

C
$$E_{cell}$$ in the intensive property while $$\triangle_{r}G$$ of cell reaction is an extensive property.

D
$$E_{cell}$$ in the intensive property while $$\triangle_{r}G$$ of cell reaction is an intensive property.

Solution

An intensive property is a bulk property, meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system.

An extensive property is a property that changes when the size of the sample changes

$$\Delta G=-nF{ E }_{ cell }$$
In the above equation the free energy equation is dependent on amount of material of system whereas electrode potential is independent on amount of system.

$$E_{cell}$$ is an intensive property and $$\Delta G$$ is an extensive property
Question 6
1 / -0

Assertion: The anions in an electrolytic cell migrate to the cathode.
Reason: Positively charged ions are attracted to the negatively charged cathode in an electrolytic cell.

A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion

B
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

C
Assertion is true but Reason is false

D
Assertion is false but Reason is true

E
Both Assertion and Reason are false

Solution

If you apply an electrical current, the positive ions migrate to the cathode while the negative ions will migrate to the anode.
positive charge ions are always attracted to the negative charged

so the assertion are wrong and reason are right
Question 7
1 / -0

Which instrument is used for the completion of the circuit of an electrochemical cell?

A
Conductivity tester

B
Salt bridge

C
Thermometer

D
Buret

E
Graduated cylinder

Solution

Salt bridge is used for the completion of the circuit of an electrochemical cell.
Salt bridge provides electrical contact between two solutions and thereby completes the electrical circuit.
It prevents mixing of electrode solutions.
It maintains the electrical neutrality in both solutions by a flow of ions.
Question 8
1 / -0

In an electrochemical cell, cathode is :

A
always neutral

B
always positive

C
the electrode at which reduction takes place

D
always negative

Solution

In an electrochemical cell, cathode is the electrode, at which reduction takes place and electrons are gained by some species.
Anode is the electrode, at which oxidation takes place and the electrons are lost by some species.
Question 9
1 / -0

Which of the following comes out at the anode during electrolysis of copper chloride?

A
Copper

B
Hydrogen

C
Copper chloride

D
Chlorine

Solution

Chlorine comes out at the anode during electrolysis of copper chloride.

This is because chloride ions have lower discharge (or lower reduction) potential than hydroxide ions.

$$\displaystyle Cl^- \rightarrow Cl + e^- \\ Cl + Cl \rightarrow Cl_2 \uparrow$$

Hence, the correct option is D.
Question 10
1 / -0

Select among the following statements that characterize a galvanic cell?
I: Oxidation occurs at the anode, which is negative.
II: Oxidation occurs at the anode, which is positive.
III. Reduction occurs at the cathode, which is positive.

A
II only

B
III only

C
I and III

D
I, II and III

E
II and III

Solution

The statements I and III characterized a galvanic cell.
I: Oxidation occurs at the anode, which is negative.
Oxidation at anode results in the transfer of electrons to the electrode. The anode, therefore, acquires a negative charge that corresponds to a low potential.

III. Reduction occurs at the cathode, which is positive.
The species that undergoes reduction at cathode removes electrons from cathode leaving a positive charge on it which corresponds to a high potential.

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Electrochemistry Test - 33

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Electrochemistry Test - 33

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SHARING IS CARING

Question 1

Applying grease

Applying paint

Applying a coating of zinc

All of the above

Solution

Question 2

electricity

electrolyte

electrolysis

non-electrolysis

Solution

Question 3

electrolytes

non-electrolytes

weak electrolytes

all of the above

Solution

Question 4

$$HCl_{(aq)}\rightarrow H^{+}+Cl^{-}$$

$$KOH\rightarrow K^{+}+OH^{-}$$

$$AgNO_3\rightarrow Ag^{+}+NO_3\,^{-}$$

all of the above

Solution

Question 5

$$E_{cell}$$ and $$\triangle_{r}G$$ of cell reaction both are extensive properties

$$E_{cell}$$ and $$\triangle_{r}G$$ of cell reaction both are intensive properties

$$E_{cell}$$ in the intensive property while $$\triangle_{r}G$$ of cell reaction is an extensive property.

$$E_{cell}$$ in the intensive property while $$\triangle_{r}G$$ of cell reaction is an intensive property.

Solution

Question 6

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

Assertion is true but Reason is false

Assertion is false but Reason is true

Both Assertion and Reason are false

Solution

Question 7

Conductivity tester

Salt bridge

Thermometer

Buret

Graduated cylinder

Solution

Question 8

always neutral

always positive

the electrode at which reduction takes place

always negative

Solution

Question 9

Copper

Hydrogen

Copper chloride

Chlorine

Solution

Question 10

II only

III only

I and III

I, II and III

II and III

Solution

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