Topic: Electrochemistry, Test No.: 02, Total MCQs: 15
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Question 1 |
Li occupies higher position in the electrochemical series of metals as compared to Cu since [West Bengal CET 2012]
the standard reduction potential of Li+/Li is lower than that of Cu2+/Cu | |
the standard reduction potential of Cu2+/Cu is lower than that of Li+/Li | |
the standard oxidation potential of Li/Li+ is lower than that of Cu/Cu2+ | |
Li is smaller in size as compared to Cu |
Question 2 |
The standard reduction potential Eo for half reactions are
Zn = Zn2+ + Ze Eo = +0.76 V
Fe = Fe2+ + Ze Eo = + 0.41 V
The EMF of the cell reaction Fe2+ + Zn = Zn2+ + Fe is [West Bengal JEE 2011]
– 0.35 V | |
+ 0.35 | |
+ 1.17 V | |
– 1.17 V |
Question 3 |
Consider the following cell reaction:
2Fe(s) + O2(g) + 4H+(aq) ® 2Fe2+(aq) + 2H2O(l); E° = 1.67 V
At [Fe2+] = 10–3 M, P(O2) = 0.1 atm and pH = 3, the cell potential at 25°C is [IIT JEE 2011]
1.47 V | |
1.77 V | |
1.87 V | |
1.57 V |
Question 4 |
The reduction potential of hydrogen half-cell will be negative if: [AIEEE 2011]
p(H2) = 2 atm and [H+] = 2.0 M | |
p(H2) = 1 atm and [H+] = 2.0 M | |
p(H2) = 1 atm and [H+] = 1.0 M | |
p(H2) = 2 atm and [H+] = 1.0 M |
Question 5 |
Given 
. The value of
standard electrode potential for the change, 
+ e- ® Fe2+ will be [AIEEE 2009]
–0.072 V | |
0.385 V | |
0.770 V | |
–0.270 V |
Question 6 |
Hydrogen gas is not liberated when the following metal is added to dil. HCl. [Karnataka CET 2008]
Mg | |
Sn | |
Ag | |
Zn |
Question 7 |
Electrolysis of dilute aqueous NaCl solution was carried out by passing 10 milliampere current. The time required to liberate 0.01 mol of H2 gas at the cathode is (1 Faraday = 96500 C mol-1) [IIT JEE 2008]
9.65 ´ 104 s | |
19.3 ´ 104 s | |
28.95 ´ 104 s | |
38.6 ´ 104 s |
Question 8 |
Given 
= -0.42
V
The potential for the cell
Cr / Cr3+ (0.1 M) || Fe2+ (0.01 M) | Fe is [AIEEE 2008]
–0.26 V | |
0.26 V | |
0.339 V | |
–0.339 V |
Question 9 |
Given the data at 25°C,
Ag + I− → AgI + e− ; Eo = 0.152 V
Ag → Ag+ + e−; Eo = −0.800 V
What is the value of log Ksp for AgI?
[AIEEE 2006]
–8.12 | |
+8.612 | |
–37.83 | |
–16.13 |
Question 10 |
The hydrogen electrode is dipped in a solution of pH 3 at 25°C. The potential would be (the value of 2.303 RT/F is 0.059 V) [Karnataka CET 2005]
0.177 V | |
0.087 V | |
0.059 V | |
–0.177 V |
Question 11 |
The rusting of iron takes place as follows
2H+ + 2e- + 
O2 ®
H2O(l); E° = +1.23 V
Fe2+ + 2e- ® Fe(s); E° = -0.44 V
Calculate ΔG° for the net process [IIT JEE 2005]
-322 kJ mol-1 | |
-161 kJ mol-1 | |
-152 kJ mol-1 | |
-76 kJ mol-1 |
Question 12 |
|
Electrolyte |
KCl |
KNO3 |
HCl |
NaOAc |
NaCl |
|
L¥(S cm2mol-1) |
149.9 |
145 |
426.2 |
91 |
126.5 |
Calculate 
using appropriate
molar conductances of the electrolytes listed above at infinite dilution in H2O
at 25°C [AIEEE 2005]
517.2 | |
552.7 | |
390.7 | |
217.5 |
Question 13 |
Zn | Zn2+ (a = 0.1M) || Fe2+ (a = 0.01M)|Fe. The emf of the above cell is 0.2905 V. Equilibrium constant for the cell reaction is [IIT JEE 2004]
100.32/0.0591 | |
100.32/0.0295 | |
100.26/0.0295 | |
e0.32/0.295 |
Question 14 |
In a cell that utilizes the reaction
Zn(s) + 2H+ (aq) ® Zn2+ (aq) + H2(g) addition of H2SO4 to cathode compartment, will: [AIEEE 2004]
lower the E and shift equilibrium to the left | |
lower the E and shift the equilibrium to the right | |
increase the E and shift the equilibrium to the right | |
increase the E and shift the equilibrium to the left |
Question 15 |
The 
values of Cr, Mn, Fe
and Co are -0.41, + 1.57, +0.77 and +1.97 V respectively.
For which one of these metals the change in oxidation state from +2 to +3 is easiest? [AIEEE 2004]
Cr | |
Mn | |
Fe | |
Co |