Electrochemistry Test

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Electrochemistry Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

When metals corrodes, it is being :

A
dissolved into surrounding moisture

B
weakened structurally

C
chemically combined with another metal

D
reacted with oxygen

Solution

Corrosion is basically the formation of a layer of oxide on metals.

It is the process which leads to the destruction of metal.

Hence when it is being reacted with oxygen, it is corroded.

Hence the option D is correct.
Question 2
1 / -0

In three test tubes $$P, Q$$, and $$R$$ iron nails, water, oil and anhydrous calcium chloride is taken. Among these test tubes, in which test tubes corrosion of nails will not take place?

A
$$P, Q$$ and $$R$$

B
$$P$$ and $$R$$

C
$$P$$ and $$Q$$

D
$$Q$$ and $$R$$

Solution

Conditions necessary for the rusting of iron:
$$\bullet$$ Presence of air (or oxygen)
$$\bullet$$ Presence of water (or moisture).
Question 3
1 / -0

The equilibrium constant of the reaction;
$$Cu\left( s \right) +2{ Ag }^{ + }\left( aq \right) \longrightarrow { Cu }^{ 2+ }\left( aq \right) +2Ag\left( s \right) $$
$${ E }^{ o }=0.46V$$ at $$298 K$$

A
$$2.4\times { 10 }^{ 10 }$$

B
$$2.0\times { 10 }^{ 10 }$$

C
$$4.0\times { 10 }^{ 10 }$$

D
$$4.0\times { 10 }^{ 15 }$$

Solution

$$Cu\left( s \right) +2{ Ag }^{ 2+ }\left( aq \right) \longrightarrow { Cu }^{ 2+ }\left( aq \right) +2Ag\left( s \right)$$
$$ { E }^{ o }=0.46 V$$ at $$298 K$$
$$\log { { K }_{ C }= } \dfrac { nF{ E }^{ o } }{ RT } $$
$$=\dfrac { 2\times 0.46 }{ 0.059 }$$
$$ { K }_{ C }=4\times { 10 }^{ 15 }$$
Question 4
1 / -0

One Faraday is equal to:

A
$$9650\ coulomb$$

B
$$10,000\ coulomb$$

C
$$19640\ coulomb$$

D
$$96500\ coulomb$$

Solution

One faraday of charge is the magnitude of the charge of one mole of electrons, i.e.96500 C. Expressed in faradays, the Faraday constant F equals "1 Faraday of charge per mole".
Question 5
1 / -0

Conductivity of a solution is affected by:

A
addition of water

B
process of heating

C
addition of acetic acid

D
all of the above

Solution

Conductivity of a solution is affected by $$(A)$$ Addition of water $$(B)$$ Process of heating and $$(C)$$ Addition of acetic acid.
The above changes affect the solute concentration which in turn affects the number of current-carrying ions present per unit volume of solution. This affects the conductivity of the solution.
Question 6
1 / -0

Amount of energy used in the passage of $$1\ amp$$ current for $$100\ sec$$ under a potential of $$115\ V$$ is:

A
$$20\ kJ$$

B
$$11.5\ kJ$$

C
$$115\ kJ$$

D
$$0.115\ kJ$$

Solution

$$Q = I\times t $$

$$Q= 1\times 100 $$

$$Q= 100C$$

Now,
$$Energy = charge \times potential$$

$$Energy= 100\times 115 $$

$$Energy= 11500\ J $$

$$Energy= 11.5\ kJ$$.
Question 7
1 / -0

Number of faradays' required to generate one gram atom of magnesium from molten $$MgCl_{2}$$ is_________.

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution

$$Mg^{2+} + 2e^{-} \rightarrow Mg$$
$$1\ mole$$ of $$Mg$$ atom requires $$2\ mole$$ of electrons, i.e., $$2$$ faraday of charge.
Question 8
1 / -0

Substance which give good conducting aqueous solution are called:

A
weak electrolytes

B
strong electrolytes

C
non-electrolytes

D
catalysts

Solution

A strong electrolyte is a solute that completely or almost completely ionizes or dissociates in a solution. They have good conductance in aqueous solution.
Question 9
1 / -0

A solution of sodium sulphate in water is electrolysed using platinum electrodes. The products at cathode and anode are respectively:

A
$$H_{2}, O_{2}$$

B
$$O_{2}, H_{2}$$

C
$$O_{2}, Na$$

D
$$O_{2}, SO_{2}$$

Solution

At cathode (negative electrode) reduction occurs,
$$2H^++2e^-\longrightarrow H_2\uparrow$$
At anode (positive electrode) oxidation occurs.
$$2O^{2-}\longrightarrow O_2+4e^-$$
(Refer to Image)
Question 10
1 / -0

I. Cathode is $$-ve$$ terminal both in electrochemical and electrolytic cells.
II. Reduction occurs at cathode both in galvanic as well as electrolytic cells.
III. Chemical change in electrolytic cell is non-spontaneous.
Which of the above statements are correct?

A
All the statements are correct

B
II and III are correct

C
I and III are correct

D
Only II is correct

Solution

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Electrochemistry Test - 39

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Question 1

dissolved into surrounding moisture

weakened structurally

chemically combined with another metal

reacted with oxygen

Solution

Question 2

$$P, Q$$ and $$R$$

$$P$$ and $$R$$

$$P$$ and $$Q$$

$$Q$$ and $$R$$

Solution

Question 3

$$2.4\times { 10 }^{ 10 }$$

$$2.0\times { 10 }^{ 10 }$$

$$4.0\times { 10 }^{ 10 }$$

$$4.0\times { 10 }^{ 15 }$$

Solution

Question 4

$$9650\ coulomb$$

$$10,000\ coulomb$$

$$19640\ coulomb$$

$$96500\ coulomb$$

Solution

Question 5

addition of water

process of heating

addition of acetic acid

all of the above

Solution

Question 6

$$20\ kJ$$

$$11.5\ kJ$$

$$115\ kJ$$

$$0.115\ kJ$$

Solution

Question 7

$$1$$

$$2$$

$$3$$

$$4$$

Solution

Question 8

weak electrolytes

strong electrolytes

non-electrolytes

catalysts

Solution

Question 9

$$H_{2}, O_{2}$$

$$O_{2}, H_{2}$$

$$O_{2}, Na$$

$$O_{2}, SO_{2}$$

Solution

Question 10

All the statements are correct

II and III are correct

I and III are correct

Only II is correct

Solution

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