Electrochemistry Test

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Electrochemistry Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

How much oxygen witt be liberated at $$N.T.P$$, by $$2A$$ current passing for $$3$$ minutes and $$13$$ seconds through acidulated water? (Equivalent weight of oxygen = $$8$$)

A
$$0.032 g$$

B
$$0.541g$$

C
$$0.629 g$$

D
$$0.713g$$

Solution

From Faraday's law of Electrolysis,

$$m=\dfrac{current\times time\times Eq.\ wt.}{F}$$

$$\Rightarrow m=\dfrac{2\times193\times8}{96500}$$

$$\Rightarrow m=0.032\ g$$
Question 2
1 / -0

Negative terminal of a dry cell is formed by:

A
zinc container

B
carbon rod

C
graphite rod

D
both A and B

Solution

The dry cell consists of Zinc container which acts as anode and the cathode is a carbon (graphite) rod.
Question 3
1 / -0

Which of the following statement is correct-

A
$$E_{cell} $$ & $$\Delta_r G$$ of cell reaction are extensive properties

B
$$E_{cell} $$ & $$\Delta_r G$$ of cell reaction are intensive properties

C
$$E_{cell}$$ is an intensive property while $$\Delta_rG$$ of cell reaction is an extensive property

D
$$E_{cell}$$ is an intensive property while $$\Delta_rG$$ of cell reaction is an intensive property

Solution

Extensive properties are those that depend on the amount of substance in a system, such as mass, volume, enthalpy, and entropy.
Where as; intensive properties do not depend on the amount of substance, and include properties like temperature, density, and molar mass.
Question 4
1 / -0

A dry cell converts chemical energy into:

A
mechanical energy

B
heat energy

C
electrical energy

D
light energy

Solution

A dry cell converts chemical energy into electrical energy.
Question 5
1 / -0

Charge produced in butane $$-O_{2}$$ Fuel cell if $$2\ mol$$ butane is consumed, will be

A
$$23 F$$

B
$$49 F$$

C
$$26 F$$

D
$$52 F$$
Question 6
1 / -0

Same quantity of current is passed through molten NaCl and molten $$Al_{2}O_{3}$$. If 4.6 g of Na was deposited in one cell, the mass of Al deposited in other cell is:-

A
0.9 g

B
1.8 g

C
2.7 g

D
3.6 g

Solution
Question 7
1 / -0

The cathode in the central compartment of Castner Kellner cell used for the manufacture of $$NaOH$$ is:

A
Iron

B
Carbon

C
Mercury

D
Steel

Solution

The apparatus shown is divided into two types of cells separated by slate walls. The first type, shown on the right and left of the diagram, uses an electrolyte of sodium chloride solution, a graphite anode (A), and a mercury cathode (M). The other type of cell, shown in the center of the diagram, uses an electrolyte of sodium hydroxide solution, a mercury cathode (M), and an iron anode (D).
Question 8
1 / -0

A reversible galvanic cell is connected to an external battery. If the EMF of the battery is less than the EMF of the galvanic cell, then the current:

A
will not pass through the circuit

B
will flow from the battery to the galvanic cell

C
will flow from the galvanic cell to the battery

D
can flow in any direction

Solution

If the EMF of a battery is less than the EMF of an electro-chemical cell, then the current will flow from the electro-chemical cell to the battery. As, the current always flows from a higher potential to a lower potential.
Hence, option C is correct.
Question 9
1 / -0

Faraday laws hold good :

A
at all pressures

B
only at 298k

C
in all concentrations

D
in different solvents

Solution

Faradays laws are independent of temperature, or concentration
Faradays laws are applicable at all concentrations.
Hence, option C is correct.
Question 10
1 / -0

In hydrogen evolution type of corrosion with respect to hydrogen electrode which of the following is correct ?

A
the metal with more negative SRP value under the given conditions

B
the metal with more positive SRP value under the given conditions

C
the metal with both negative and positive SRP values

D
All the above

Solution

Any metal lying below hydrogen electrode will reduce $$H^+$$ ions to give $$H_2$$ gas, while any metal lying above hydrogen will not reduce $$H^+$$ ions.

Thus metals like $$Fe, Zn ,Cd$$ etc lying below hydrogen with more negative $$SRP$$ capable of reacting with dilute acids while metals like $$Ag, Cu$$ etc which lie above hydrogen electrode, can not evolve hydrogen with dilute acids.

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Electrochemistry Test - 19

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Electrochemistry Test - 19

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Question 1

$$0.032 g$$

$$0.541g$$

$$0.629 g$$

$$0.713g$$

Solution

Question 2

zinc container

carbon rod

graphite rod

both A and B

Solution

Question 3

$$E_{cell} $$ & $$\Delta_r G$$ of cell reaction are extensive properties

$$E_{cell} $$ & $$\Delta_r G$$ of cell reaction are intensive properties

$$E_{cell}$$ is an intensive property while $$\Delta_rG$$ of cell reaction is an extensive property

$$E_{cell}$$ is an intensive property while $$\Delta_rG$$ of cell reaction is an intensive property

Solution

Question 4

mechanical energy

heat energy

electrical energy

light energy

Solution

Question 5

$$23 F$$

$$49 F$$

$$26 F$$

$$52 F$$

Question 6

0.9 g

1.8 g

2.7 g

3.6 g

Solution

Question 7

Iron

Carbon

Mercury

Steel

Solution

Question 8

will not pass through the circuit

will flow from the battery to the galvanic cell

will flow from the galvanic cell to the battery

can flow in any direction

Solution

Question 9

at all pressures

only at 298k

in all concentrations

in different solvents

Solution

Question 10

the metal with more negative SRP value under the given conditions

the metal with more positive SRP value under the given conditions

the metal with both negative and positive SRP values

All the above

Solution

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