StudentAidUnit 10: Unit 10: Electrochemistry — Mcqs
11th Class Chemistry · Unit 10: Electrochemistry
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1.The activity series of metals arranges metals in order of their:
2.Which of the following metals would most readily displace hydrogen gas from dilute acids?
3.The salt bridge allows transfer of ___ in Zn-Cu voltaic cell.
- a Zn2+ ions
- b SO42- ions
- c Both
- d None of these
4.If Zn-Cu galvanic cell works ideally after complete discharge, both compartments will have:
5.Which of the following half-reaction represents a reduction process?
- a Zn(s) ⟶ Zn2+(aq) + 2e
- b Fe2+(aq) ⟶ Fe3+(aq) + e
- c Cl2(g) + 2e ⟶ 2Cl-(aq)
- d 2H+(aq) + 2e ⟶ H2(g)
6.Which of the following half-reaction represents the oxidation process occurring in the disproportionation of Cu2+?
7.If salt bridge is not used, between two half cells in a Galvanic cell, then the voltage:
8.In an electrolysis experiment, if a charge of 96,500 Coulombs is passed through a solution, the amount of substance liberated or deposited at the electrode is directly related to:
9.The experimental determination of Avogadro's number through electrolysis typically involves measuring:
10.The principle of measuring DO by Winkler's Method is based on:
11.A positive value for the standard electrode potential (E°) of a metal ion/metal half-cell (e.g., Cu2+/Cu) indicates that:
12.Which of the following changes would typically lead to an increase in the rate of electrolysis?
- a Decreasing the concentration of the electrolyte
- b Increasing the distance between the electrodes
- c Decreasing the surface area of the electrolytic cell
- d Increasing the current passed through the electrolytic cell
SLO Based Multiple Choice Questions
Redox Reactions and Oxidation Numbers
13.Which of the following best defines oxidation?
14.What is the oxidation number of chlorine in NaClO3?
15.In the reaction: Fe ⟶ Fe2+ + 2e, iron is:
16.Which of the following is an example of a disproportionation reaction?
17.Which species is reduced in the following reaction? Zn + Cu2+ ⟶ Zn2+ + Cu.
18.Oxidation number of oxygen in H2O2 is:
19.The oxidation number of sulfur in H2SO4 is:
20.Redox reactions always involve:
21.The reducing agent in a redox reaction:
22.In redox reactions, oxidizing agents are:
Electrochemical Cells
23.In a galvanic cell, the anode is:
24.Electrons in a galvanic cell flow from:
25.Which component maintains electrical neutrality in an electrochemical cell?
26.Standard hydrogen electrode is assigned a potential of:
27.The cathode in an electrolytic cell is:
28.The anode in electrolysis of molten NaCl is:
29.In electrolysis, reduction always occurs at:
30.A Daniell cell produces electricity through:
31.A salt bridge is usually made from:
32.Cell potential is the difference between:
Standard Electrode Potentials & Electrochemical Series
33.Standard electrode potential is measured under:
34.A more negative E° value means the electrode:
35.Which metal is the best reducing agent?
36.Which element has E° = 0.00 V?
- a H+
- b H2
- c SHE
- d All of the above
37.A spontaneous redox reaction occurs if:
38.The E°cell of a cell is calculated as:
39.Which of the following elements cannot displace hydrogen from acid?
40.Which metal lies below hydrogen in the electrochemical series?
41.Which of the following will react with HCl to liberate H2 gas?
42.The more positive the standard reduction potential:
Electrolysis & Faraday's Laws
43.Electrolysis is the process of:
44.Electrolysis requires:
45.Faraday's First Law states that mass deposited is directly proportional to:
46.One Faraday is equal to:
47.Electrochemical equivalent is:
48.If 1 Faraday of electricity is passed, the mass deposited equals:
49.Electroplating involves:
50.Electrolysis of CuSO4 using copper electrodes results in:
51.Electrolyte in electroplating of silver is:
52.The number of coulombs required to deposit 1 mole of Ag+:
Applications and Industrial Electrochemistry
53.The process of coating a metal with zinc is called:
54.In electroplating, the object to be plated is connected to:
55.Electrolysis is used in the extraction of:
56.The process of purifying copper using electricity is called:
57.The metal deposited at cathode during electrolysis of NaCl is:
58.Which of the following is not a use of electrochemistry?
59.Electrolysis of brine produces:
60.Downs cell is used for extraction of:
61.In the Hall-Heroult process, aluminum is obtained by:
62.Electrochemical cells convert chemical energy into:
Advanced Concepts and Problem Solving
63.If E°cell is +1.10 V, the reaction is:
64.What is the unit of cell potential?
65.Which metal will displace Cu from CuSO4 solution?
66.For a redox reaction to be spontaneous, ΔG should be:
67.Which half-cell has the highest tendency to gain electrons?
68.In an electrochemical cell, which ion migrates cathode through the salt bridge?
69.Electrochemical series helps in predicting:
70.If E° for Zn2+/Zn is -0.76 V and for Cu2+/Cu is +0.34 V, then E°cell is:
71.The reaction at the cathode is always:
72.An increase in temperature generally:
- a Increases cell voltage
- b Decreases cell voltage
- c No effect
- d Depends on pressure