Free Electrochemistry MCQs with Answers
696 Electrochemistry MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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Read the Electrochemistry notesFree MDCAT chapter notes with key terms696 questions · page 26 of 35
- A. Free charge from zinc sulphate solution
- B. Electrons
- C. Protons
- D. Zinc ions
Explanation: In a galvanic cell, the copper compartment becomes negatively charged due to the arrival of electrons.
Correct answer: Electrons502. Metals are_?
- A. Reducing agents
- B. Oxidizing agents
- C. Both A and B
- D. Dehydrating agent
Explanation: Metals are strongly electropositive, which means they tend to lose electrons easily.
Correct answer: Reducing agents- A. Excited
- B. Energized
- C. Free
- D. In random motion
Explanation: In an ionic solid, ions are held together by strong electrostatic forces, making them immobile and unable to conduct electricity in the…
Correct answer: Free- A. Mechanical energy
- B. Electromechanical energy
- C. Electrochemistry
- D. Chemical energy
Explanation: Electrochemistry is the correct answer because it specifically refers to the field of study that deals with the conversion between…
Correct answer: Electrochemistry- A. Sodium
- B. Hydrogen
- C. Chlorine
- D. Oxygen
Explanation: In the electrolysis of a concentrated aqueous solution of NaCl, chloride ions (Cl-) are oxidized at the anode to form chlorine gas (Cl2).
Correct answer: Chlorine- A. At the start of the procedure
- B. Somewhere in the middle of balancing
- C. After Adding two half reactions
- D. Before Adding two half reactions
Explanation: In electrochemistry, it is crucial to balance the number of electrons lost in the oxidation half-reaction with the number of electrons…
Correct answer: Before Adding two half reactions- A. 373K
- B. 298K
- C. 350K
- D. All of these
Explanation: The correct answer is 298K, which is equivalent to 25°C. This temperature is considered the standard temperature for measuring and…
Correct answer: 298K- A. Graphite
- B. Copper
- C. Molten sodium chloride
- D. Mercury
Explanation: The correct answer is molten sodium chloride. When sodium chloride is in its molten state, it dissociates into sodium and chloride ions…
Correct answer: Molten sodium chloride509. In an aqueous solution of barium nitrate, the [NO-3] is 0.080M. This solution can be labeled as:
- A. 0.040 N Ba(NO2)2
- B. 0.160 M Ba(NO3)2
- C. 0.080 N Ba(NO3)2
- D. 0.080 M NO-3
Explanation: In Ba3(NO3)2, the molar ratio of Ba(NO3)2 to NO-3 is 1 : 2. Therefore, the molarity of the Ba(NO3)2 solution is: 1/2 x 0.0080=0.040M As n…
Correct answer: 0.080 N Ba(NO3)2- A. 40 mL
- B. 20 mL
- C. 10 mL
- D. 60 mL
Explanation: N1V1=N2V2 (H3PO3 is dibasic ; M = 2N)20 x 0.2 = 0.1 x VV = 40 ml
Correct answer: 40 mL- A. 6M1V1=M2V2
- B. M1V1=6M2V2
- C. N1V1=2N2V2
- D. M1V1=M2V2
Explanation: Following is the solution to this question:
Correct answer: 6M1V1=M2V2- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Following is the solution to this question:
Correct answer: Option A- A. 23
- B. 12
- C. 24
- D. 13
Explanation: Following is the solution to this question:
Correct answer: 23- A. M
- B. M/10
- C. M/11
- D. M/15
Explanation: Following is the solution to this question:
Correct answer: M/15- A. 0.75
- B. 1.0
- C. 1.5
- D. 3.0
Explanation: NaClO3 + H2O → NaClO4 + H2 Oxidation number of chlorine changes from +5 (in NaClO3) to +7 (in NaClO4) Thus 2 faraday of charge will form…
Correct answer: 1.5- A. Feasible
- B. Not feasible
- C. In equilibrium
- D. None
Explanation: A negative EMF (or negative Eºcell) indicates that the cell reaction is not feasible in the forward direction under standard conditions.
Correct answer: Not feasible- A. Increases the emf of cell
- B. Decreasing the emf of cell
- C. No change in emf of cell
- D. Unpredictable
Explanation: Increasing the concentration of Sn2+ will lead to a decrease in the cell potential (EMF) of the electrochemical cell.
Correct answer: Decreasing the emf of cell- A. +4
- B. -4
- C. +6
- D. Zero
Explanation: Net charge on carbon in glucose is zero.C6H12O66x+12+(-2)6=0Let x be net oxidation state of carbon.6x=0x=0Option D accurately represents…
Correct answer: Zero- A. -2, -1
- B. +2, -1
- C. -1, +2
- D. +2, +1
Explanation: Option B is correct.The oxidation number of oxygen atom in OF2 and H2O2 are different.In OF2, the oxidation number of oxygen is +2.
Correct answer: +2, -1- A. H
- B. I
- C. S
- D. O
Explanation: Option C is correct.The element on the reactant side which has been reduced in the equation is sulfur.
Correct answer: S