Free Electrochemistry MCQs with Answers

• A. Alcohols
• B. Aldehydes
• C. Oxygen
• D. Hydrogen

Explanation: During electrolysis, the hydroxide ions discharge in the following half-reaction: 2OH- + 2e → 1/2 O2 + H2OWater and oxygen gas are…

• A. Graphite
• B. Copper
• C. Iron
• D. Inert material

Explanation: The Downs process is a method for the commercial preparation of metallic sodium, in which molten NaCl is electrolyzed in a special…

• A. 273K
• B. 293K
• C. 298K
• D. 292K

Explanation: Option A is wrong because standard electrode potential is not measured at 273K.

• A. Two electrolytes
• B. Anode and Cathode
• C. Oxidation Half cell and Reduction half Cell
• D. All of these

Explanation: Option A : In a voltaic cell, two half-cells are separated by an electrolyte, which is a solution containing ions that can conduct…

• A. Graphite
• B. Copper
• C. Iron
• D. Silver

Explanation: Option: A The Downs cell uses a carbon(graphite) anode and an iron cathode.

• A. E
• B. E-1
• C. Eo
• D. A

Explanation: The standard electrode potential, denoted by E°, is the measure of potential of a reaction that occurs at the electrode when all the…

• A. Water can be added
• B. H+ ions can be added
• C. Both A and B
• D. OH- ions can be added

Explanation: In acidic conditions, the oxygen atoms should be balanced with water, while hydrogen atoms should be balanced with H+.

• A. Oxidation number on Reactants
• B. Oxidation number on products
• C. Oxidation numbers for both reactants and products
• D. None of these

Explanation: Refer to the following image: Writing down the skeleton equation of the redox reaction is the first step.

• A. To vaporize
• B. To be oxidize and reduce simultaneously
• C. To form hydrogen bonds
• D. All of these

Explanation: Is correct as in electrolysis the elements oxidize and reduce simultaneously making it a redox reaction and the redox reaction is complex.

• A. 1.01V
• B. 1.23V
• C. 1.1V
• D. 1.44V

Explanation: Standard cell potential of Zn-Cu cell is 1.1V.

• A. Dilute NaCl
• B. Fused NaCl
• C. Concentrated NaCl solution
• D. NaCl solution

Explanation: Caustic soda is obtained on industrial scale by electrolysis of con.aquous solution of Nacl in Nelson cell and castner-kellner cell or Hg…

• A. Reactivity series
• B. Potential difference
• C. Activated potential
• D. Electrochemical series

Explanation: Electrochemical series is a series in which elements are arranged in an increasing or decreasing order of their standard electrode…

• A. Aqueous NaCl
• B. Aqueous NaNO3
• C. Fused NaCl
• D. Fused NaNO3

Explanation: Option C is correct since Down's cell is used for the electrolysis of fused NaCl.Option A is incorrect since, in the Castner-Kellner…

• A. Unity
• B. Negative
• C. 1
• D. 0

Explanation: Option D is correct since in a neutral atom the charge is zero. So if we equate all the oxidation numbers we get zero.Option A is…

• A. Their temperature
• B. Their concentration
• C. Their Activation Energy
• D. All of these

Explanation: Option B is correct since the order of discharge of ions in an electrolytic cell depends on concentration.

• A. Cathode, Anode
• B. Anode, Cathode
• C. Right, left
• D. None of these

Explanation: In a Voltaic Cell, which is also known as a galvanic cell, electrons flow from the anode to the cathode.

• A. Complex
• B. Predictable
• C. Unpredictable
• D. All of these

Explanation: When a molten salt is electrolyzed the products are predictable because when an aqueous solution of a salt is electrolyzed, hydrogen and…

• A. ∩
• B. ⋮⋮
• C. ≡
• D. ‖

Explanation: The salt bridge is represented by double line i.e, ‖

• A. First balance Hydrogen
• B. First balance Oxygen
• C. Balance both at the same time
• D. Order doesn't matter

Explanation: Determine the number of oxygen and hydrogen atoms on both sides of the chemical equation.

• A. Buffer
• B. Salt Bridge
• C. Electrical Conductor
• D. All of these options are correct

Explanation: The platinum in the standard hydrogen electrode (SHE) acts as an electric conductor.