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 34 of 35
- A. Oxidize the compound
- B. Reduce the compound
- C. Electrolyze the compound
- D. None of the above
Explanation: Oxidize the compound: A stronger reduction potential indicates that the compound is more likely to undergo reduction rather than…
Correct answer: Oxidize the compound- A. MnO2
- B. Cl2
- C. NaOH
- D. Na2O2
Explanation: NaOH is not an oxidizing agent. It is a strong base that does not readily accept electrons or participate in redox reactions.
Correct answer: NaOH- A. Cl^-
- B. Ne
- C. Na
- D. Ca
Explanation: The correct answer is Ca. Calcium, as a metal, has a low electronegativity and readily donates electrons, making it a strong reducing…
Correct answer: Ca- A. Small negative values
- B. Large negative values
- C. Small positive values
- D. Large positive values
Explanation: The correct answer is Large negative values. A strong reducing agent has a large negative standard reduction potential.
Correct answer: Large negative values- A. I-1> Br->Cl-> F-
- B. F->Cl-> Br-> l-
- C. l-1>Cl-> F-> Br-
- D. Br->Cl-> l-> F-
Explanation: From the reduction potential values, it can be seen that iodide is the best-reducing agent.
Correct answer: I-1> Br->Cl-> F-- A. +4
- B. +2
- C. -1
- D. -4
Explanation: We know that the charge of Na is always +1, and the overall charge on the Na2C2 molecule is 0.
Correct answer: -1- A. Strong oxidizing agent
- B. Strong reducing agent
- C. Very weak oxidizing agent
- D. Very weak reducing agent
Explanation: The correct answer is that chromium compounds in which the oxidation state of chromium is 2+ behave as strong reducing agents.
Correct answer: Strong reducing agent- A. H2 + Cl2 --> 2HCl
- B. C2H4 + H2 --> C2H6
- C. 2Na + H2 --> 2NaH
- D. N2 + 3H2 --> 2NH3
Explanation: In the correct reaction, 2Na + H2 --> 2NaH, sodium (Na) is oxidized, as it loses electrons to form Na+, while hydrogen (H2) is reduced to…
Correct answer: 2Na + H2 --> 2NaH- A. +1
- B. +5
- C. -1
- D. +3
Explanation: In the compound NCLO3, the oxidation state of Cl (chlorine) is indeed +5.
Correct answer: +1- A. Oxygen
- B. Fluorine
- C. chlorine
- D. Both (A) & (C)
Explanation: Fluorine has a consistent oxidation number of -1 in all of its compounds because it is the most electronegative element and always gains…
Correct answer: Fluorine- A. Mn+4
- B. Mn-1
- C. Mn+6
- D. All of the above
Explanation: So, an oxidizing agent is a substance that causes other substances to lose electrons, resulting in oxidation.
Correct answer: Mn+4- A. Cl2
- B. F2
- C. Br2
- D. I2
Explanation: A reducing agent is a substance that causes another substance to be reduced in a chemical reaction.
Correct answer: I2- A. Ethane
- B. Potassium iodate (V)
- C. Sodium hydroxide
- D. Potassium hydroxide
Explanation: Chlorine reacts with sodium hydroxide to give NaCl and NaClO where oxidation states of Cl are different.
Correct answer: Sodium hydroxide- A. ZnSO4
- B. FeSO4
- C. AgNO3
- D. All of the above
Explanation: For a metal to be displaced in a salt solution, the metal being added must be more reactive than the metal cation in the salt.
Correct answer: AgNO3675. Which one of the following chemical reactions is represented by the equation: CI2+kBr ➔ KCl + Br2?
- A. Decomposition
- B. Redox
- C. Hydration
- D. Precipitation
Explanation: In a redox reaction, one substance is oxidized during the reaction (oxidation number increases) and another is reduced (oxidation number…
Correct answer: Redox- A. CrOCl2
- B. COCl2
- C. CrO2Cl2
- D. CrCl6
Explanation: When a mixture of K2CR2O7 and metal chloride is added in warm conc: H2SO4 Chromyl chloride ( CrO2Cl2) which forms a deep reddish brown…
Correct answer: CrO2Cl2- A. 216
- B. 324
- C. 432
- D. 540
Explanation: Explanation for this question will be added soon.
Correct answer: 432- A. Option A
- B. Option B
- C. Option C
- D. None
Explanation: Kolbe's electrolysis method is a general method of preparation of substituted hydrocarbons from the substituted carboxylic acids by the…
Correct answer: Option A679. Primary cells are used in calculators for long-service life the desirable quality of the cell is:
- A. Low energy densities
- B. No self discharge rates
- C. High self-discharge rates
- D. High energy densities
Explanation: A desirable quality of primary cells used in calculators is low or no self-discharge rates, meaning they retain their stored energy for…
Correct answer: No self discharge rates- A. Smelting
- B. Reasing
- C. Reduction
- D. Refining
Explanation: When metals are obtained from sulfide ores, the first step is typically smelting.
Correct answer: Smelting