Electrochemistry Test

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Electrochemistry Test - 70

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement is false about electrolysis?

A
The most commonly occurring chemical reaction in electrolysis is the 'chemical decomposition reaction'.

B
When an iron rod is to be electroplated with chromium, the chromium electrode is used as an anode, and the iron rod is used as a cathode.

C
During electrolysis of water, $${H_2}$$ accumulates at the cathode and $${O_2}$$ accumulates at the anode.

D
When electrolysis is used in metallurgical applications, the concentration of electrolyte changes.

Solution
Question 2
1 / -0

$${ V }_{ 1 }\ L$$ of solution A (Resistance = 50 ohm) is mixed with $${ V }_{ 2 }\ L$$ of solution B ( Resistance = 100 ohm) Resistance of final solution is 80 \ ohm then $$\dfrac { { V }_{ 2 } }{ { V }_{ 1 } } $$ will be (using same cell):

A
1

B
2

C
3

D
4

Solution
Question 3
1 / -0

In an experiment of electroplating, m grams silver deposits at cathode when 4A current is passing for 2 min. If 6A current is passed for 40 s in the same experiment, silver deposited on cathode will be

A
m/4

B
m/2

C
2m

D
4m

Solution
Question 4
1 / -0

For the following cell reaction: $$A g \left| A g ^ { + } \right| A g C l \left| C l ^ { - } \right| C l _ { 2 } , P t$$
$$\Delta G ^ { \circ } ( A g C l ) = - 109 k J / m o l$$
$$ \Delta G _ { f } ^ { \circ } ( C l ^-) = - 129{ kJ }/ mol $$ and
$$ \Delta G ^ { \circ } f \left( A g ^ { + } \right) = 78 K J / m o l $$

Find $$ E ^ { o} $$ of the cell:

A
- 0.60 V

B
0.60 V

C
6.0 V

D
None

Solution
Question 5
1 / -0

For hydrogen-oxygen fuel cell at 1 atm and 298 K
$${ H }_{ 2 }(g)+\frac { 1 }{ 2 } { O }_{ 2 }(g)\longrightarrow { H }_{ 2 }O(l),{ \Delta G }^{ \circ }=-240kJ$$
$${ E }^{ \circ }$$ FOR THE CELL IS APPROXIMATELY,

A
2.48 V

B
1.24V

C
2.5V

D
1.26 V
Question 6
1 / -0

For the process: $$ Cu^{2+}+2e^{-}\rightarrow Cu; \ log [Cu^{2+}]$$ vs. $$ E_{red}$$ graph is shown in the figure, where OA = 0.34 V. The electrode potential of the half-cell of $$ Cu/Cu^{2+}$$ (0.1 M) will be [2.3303 RT/F = 0.06]

A
$$ -0.31 V$$

B
$$ +0.31 V$$

C
$$ -0.37 V $$

D
$$ +0.37 V$$

Solution
Question 7
1 / -0

The dissociation constant for $$CH_{3}COOH$$ is $$1.8\times 10^{-5}$$ at $$298\ K$$. The electrode potential for the half-cell: $$Pt|H_{2}\ (1\ bar)\|0.5\ M\ CH_{3}COOH$$, at $$298\ K$$ is:

$$(log\ 2 = 0.3\ ;\ log\ 3 = 0.48\ ;\ 2.303\ RT/F = 0.06)$$

A
$$-0.3024\ V$$

B
$$-0.1512\ V$$

C
$$+0.3024\ V$$

D
$$+0.1512\ V$$

Solution
Question 8
1 / -0

The correct cell diagram for the following reaction and $$E^{\circ}$$ for the cell is:

$$2AgBr(s)+H_{2}(g)\rightarrow 2Ag(s)+2H^{+}+2Br^{-}$$ ; $$E_{AgBr|Ag|Br^{-}}^{^{\circ}}=+0.10V$$

A
$$(Pt)H_{2}|H^{+}||Br^{-}|AgBr|Br_{2}(Pt)\ ;\ E^{\circ}=0.10V$$

B
$$(Pt)H_{2}|H^{+}||Br^{-}|AgBr|Br_{2}(Pt)\ ;\ E^{\circ}=-0.10V$$

C
$$(Pt)Br_{2}|AgBr|Br^{-}||H^{+}|H_{2}(Pt)\ ;\ E^{\circ}= 0.10 V$$

D
$$(Pt)Br_{2}|AgBr|Br^{-}||H^{+}|H_{2}(Pt)\ ;\ E^{\circ}= -0.10V$$

Solution
Question 9
1 / -0

A volume of $$100\ ml$$ of a buffer of $$1 M \ NH_{3}$$ and $$ 1M \ NH_{4}^{+}$$ is placed in two half-cells connected by a salt bridge. A current of $$1.5\ A$$ is passed through the cell for $$20$$ minutes. If only the electrolysis of water takes place and the electrode reactions are;

Right Electrode: $$ 2H_{2}O +O_{2}+4e \rightarrow 4 OH^{-}$$

Left Electrode: $$ 2H_{2}O \rightarrow 4H^{+}+O_{2}+4e,$$

then, the $$pH $$ of:

A
right electrode will increase

B
left electrode will increase

C
both electrodes will increase

D
both electrodes will decrease
Question 10
1 / -0

Among the following, identify the correct statement?

A
Chloride ion is oxidized by $$ O_{2} $$

B
$$ Fe^{2+} $$ is oxidized by iodine

C
Iodide ion is oxidized by chlorine

D
$$Mn^{2+} $$ is oxidized by chlorine

Solution