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 13 of 35
- A. An acid
- B. A base
- C. In its own ions
- D. Water
Explanation: A) An acid, B) A base, and D) Water are all electrolytes that can cause the development of electrode potential.
Correct answer: In its own ions- A. E
- B. E1
- C. E0
- D. a
Explanation: Under standard conditions (temperature = 298K, pressure = 1 atm, concentration = 1 mol per dm),3), the standard electrode potential occurs…
Correct answer: E0- A. Electrons
- B. Charges
- C. Energy
- D. Hydrogen ions
Explanation: Redox reactions are those in which oxidation and reduction both take place.
Correct answer: Electrons- A. 0.00 volt
- B. 0.10 volt
- C. 10.0 volt
- D. 1.00 volt
Explanation: SHE is a redox electrode which forms the basis of oxidation-reduction potential.
Correct answer: 0.00 volt- A. Producing Electrons
- B. Circuit Completion
- C. Increasing speed of electrons
- D. All of these
Explanation: You need a salt bridge to complete the circuit as it contains mobile ions that act as charge carriers.
Correct answer: Circuit Completion- A. Physical state is changed
- B. Oxidation number is changed
- C. Enthalpy is changed
- D. All of these
Explanation: In balancing an equation, not only should the moles be balanced on both sides but also the charges.
Correct answer: Oxidation number is changed- A. Real Conditions
- B. Standard Conditions
- C. Positive Values
- D. Negative Values
Explanation: The standard electrode potentials are customarily determined at solute concentrations of 1 Mole per dm3 concentration, gas pressures of 1…
Correct answer: Standard Conditions- A. 6.0 L
- B. 0.60 L
- C. 1.365 L
- D. 0.91 L
Explanation: Q V/F From the chemical equation, 2 moles of electrons produce 3 moles of gases (C2H6 + 2CO2)Now, Q = ItAs given, I = 0.5At = 96.45 min =…
Correct answer: 0.91 L- A. Nelson's Cell
- B. Hg - Cell
- C. Castner Kellner Cell
- D. All of these
Explanation: Nelson's cell is an electrolytic cell that consists of a rectangular steel tank that is divided into compartments.
Correct answer: All of these- A. Electrons on the left hand side
- B. Electrons on the ride hand side
- C. Either left or right hand side
- D. None of these options is correct
Explanation: Explanation has been added. In the ion-electron method (also known as the half-reaction method), each half-reaction is balanced by adding…
Correct answer: Either left or right hand side- A. Buffer
- B. Salt Bridge
- C. Electrical Conductor
- D. All of these options are correct
Explanation: Platinum is an element with high electrical conductivity, so it will act as a electrical conductor.
Correct answer: Electrical Conductor- A. A battery
- B. Electrical wires
- C. A pipe
- D. Salt bridge
Explanation: The two metal strips, which serve as electrodes, are connected by a wire, and the compartments are connected by A salt bridge, a U-shaped…
Correct answer: Salt bridge- A. Dry cell
- B. Galvanic cell
- C. Electrolytic cell
- D. A and B
Explanation: The correct option is B. When an active metal like Al reacts with a less active element like Cu, it will form a galvanic cell.
Correct answer: Galvanic cell- A. Spontaneous
- B. Non-spontaneous
- C. Irreversible
- D. Endothermic
Explanation: The correct option is A. The galvanic cell acts as a device that simultaneously undergoes oxidation and reduction reactions.
Correct answer: Spontaneous- A. Alcohols
- B. Aldehydes
- C. Oxygen
- D. Hydrogen
Explanation: The correct option is C. Hydroxide ions are combined to give oxygen to an electrolytic cell.
Correct answer: Oxygen- A. Both anode and cathode
- B. Anode
- C. Salt bridge
- D. Cathode
Explanation: The cathode is the negative electrode through which electrons enter the electrolytic solution.
Correct answer: Cathode- A. Oxidation
- B. Redox reaction
- C. Reduction
- D. None of these
Explanation: A redox reaction consists of two parts; an oxidation half-reaction and a reduction half-reaction that always occur together.
Correct answer: Redox reaction- A. MgO
- B. NaCl
- C. NaF
- D. Na₂O
Explanation: The oxidation state of Mg in MgO is +2 as it loses two electrons during the formation of MgO.
Correct answer: MgO- A. F
- B. Li
- C. Cl
- D. Mg
Explanation: Reduction potential is the ability of a substance to get reduced. In other words, it is a measure of a substance's ability to oxidize…
Correct answer: F- A. Low
- B. High
- C. Same
- D. None of these
Explanation: Weaker electrolytes are less soluble in water as they do not ionize easily. Their ions are very strongly attracted to one another.
Correct answer: Low