Electrochemistry Test

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Electrochemistry Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

The presence of electrolytes ................ the rate of corrosion.

A
increases

B
decreases

C
sharply decreases

D
does not effect

Solution

The presence of electrolyte increase the concentration of electron and thus increasing the mobility of electron due to which rate of corrosion increases.
Question 2
1 / -0

20 mL of KOH solution was titrated with 0.20 M $$H_2SO_4$$ solution in a conductivity cell. The data obtained were plotted to give the graph shown below.
The concentration of the KOH solution was :

A
$$0.30\, mol\, L^{-1}$$

B
$$0.15\, mol\, L^{-1}$$

C
$$0.12\, mol\, L^{-1}$$

D
$$0.075\, mol\, L^{-1}$$

Solution

From the graph given, the equivalent point is reached at 15mL of H₂SO₄.
Milli-equivalents of an acid or base = n-factor x Molarity x volume (in mL)
n-factor for H₂SO₄ = 2 and for KOH = 1

We know that, at equivalent point,
m.eq. of acid = m.eq. of base
⇒ 2 x 0.20 x 15 = 1 x M x 20
⇒ M = 0.3 mol/L

Hence, option A is correct.
Question 3
1 / -0

_____ refers to amount of electricity while _____ refers to rate at which it flows.

A
Ampere, coloumb

B
Coloumb, ampere

C
Faraday, coloumb

D
Coloumb, faraday

Solution

Coulomb refers to amount of electricity while ampere refers to rate at which it flows. Coulomb is the quantity of lctricity passed through a conductor/ electrolyte when a current of 1A strength flows for 1 second. In other words, coulomb $$=$$ amperes $$\times$$ second.
Question 4
1 / -0

How many coulombs are required for the oxidation of 1 mol of $$H_2O \ to \ O_2$$?

A
$$93000 C$$

B
$$1.93\, \times\, 10^5 C$$

C
$$9.65\, \times\, 10^4 C$$

D
$$19.3\, \times\, 10^2 C$$

Solution

$$H_{2}O\, \rightarrow\, 2H^{\oplus}\, +\, 2e^-\, +\, \displaystyle \frac{1}{2}\, O_2$$
$$2\, F\, \equiv\, 1\, mol\, of\, H_2O\, =\, \displaystyle \frac{1}{2}\, mol\, of\, O_2$$
$$\therefore\, 2\, \times\, 96500\, C\, =\, 1.93\, \times\, 10^5\, C$$
Hence, option B is correct.
Question 5
1 / -0

In an electrolytic cell current flows:

A
from cathode to anode in outer circuit

B
from anode to cathode outside the cell

C
from cathode to anode inside the cell

D
none of the above

Solution
Question 6
1 / -0

When iron is rusted, it is :

A
reduced

B
oxidised

C
evaporated

D
decomposed

Solution

Oxidation of iron happens as shown in the image
Question 7
1 / -0

When the electric current is passed through a cell having an electrolyte, the positive ions move towards cathode and negative ions towards the anode. If the cathode is pulled out of the solution :-

A
the positive and negative ions will move towards anode

B
the positive ions will start moving towards the anode while negative ions will stop moving

C
the negative ions will continue to move towards anode while positive ions will stop moving

D
the positive and negative ions will start moving randomly

Solution

When the electric current is passed through a cell having an electrolyte, the positive ions move towards cathode and negative ions towards the anode. If the cathode is pulled out of the solution,
the positive and negative ions will start moving randomly not under the influence of the electrical field by due to movement of electrolyte.
Question 8
1 / -0

Corrosion of metals can be prevented when contact between metal and ________ is cut off.

A
nitrogen

B
hydrogen

C
oxygen

D
carbon

Solution

Corrosion is basically oxidation of metal in presence of oxygen. So it can be prevented by cutting off $${ O }_{ 2 }$$
Question 9
1 / -0

In an electrochemical cell that function as a voltaic cell:

A
electrons move from the cathode to the anode

B
electrons move through a salt-bridge

C
electrons can move either from the cathode to the anode or from the anode to the cathode

D
reduction occurs at the cathode

Solution

Reduction always occurs at cathode
Oxidation always occurs in anode
These two process occurs in same way independent of nature of cell whether voltaic or electrolytic.
Question 10
1 / -0

Corrosion of metals can be prevented when contact between metal and .......... is cut off.

A
Nitrogen

B
Hydrogen

C
Oxygen

D
Carbon

Solution

Corrosion of the metal can be prevented if the contact between metal and air is cut off.

Thus Option c is correct.

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Electrochemistry Test - 28

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Electrochemistry Test - 28

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Question 1

increases

decreases

sharply decreases

does not effect

Solution

Question 2

$$0.30\, mol\, L^{-1}$$

$$0.15\, mol\, L^{-1}$$

$$0.12\, mol\, L^{-1}$$

$$0.075\, mol\, L^{-1}$$

Solution

Question 3

Ampere, coloumb

Coloumb, ampere

Faraday, coloumb

Coloumb, faraday

Solution

Question 4

$$93000 C$$

$$1.93\, \times\, 10^5 C$$

$$9.65\, \times\, 10^4 C$$

$$19.3\, \times\, 10^2 C$$

Solution

Question 5

from cathode to anode in outer circuit

from anode to cathode outside the cell

from cathode to anode inside the cell

none of the above

Solution

Question 6

reduced

oxidised

evaporated

decomposed

Solution

Question 7

the positive and negative ions will move towards anode

the positive ions will start moving towards the anode while negative ions will stop moving

the negative ions will continue to move towards anode while positive ions will stop moving

the positive and negative ions will start moving randomly

Solution

Question 8

nitrogen

hydrogen

oxygen

carbon

Solution

Question 9

electrons move from the cathode to the anode

electrons move through a salt-bridge

electrons can move either from the cathode to the anode or from the anode to the cathode

reduction occurs at the cathode

Solution

Question 10

Nitrogen

Hydrogen

Oxygen

Carbon

Solution

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