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ELECTROCHEMISTRY MCQs

Total Questions : 21 | Page 1 of 3 pages
Question 1. Electrochemistry deals with
  1.    electric energy
  2.    chemical energy
  3.    only a
  4.    both a & b
 Discuss Question
Answer: Option D. -> both a & b
Question 2. What is a cathode?
  1.    It is the electrode where oxidation takes place.
  2.    It is the electrode where reduction takes place.
  3.    It is an aqueous solution containing an electrode.
  4.    It is the salt bridge that connects half-cells.
 Discuss Question
Answer: Option B. -> It is the electrode where reduction takes place.
Question 3. What is a reducing agent?
  1.    It is the species that gets reduced -- gains electrons.
  2.    It is the species that gets oxidized -- loses electrons.
  3.    It is the species that creates electrons.
  4.    It is the species that destroys electrons.
 Discuss Question
Answer: Option B. -> It is the species that gets oxidized -- loses electrons.
Question 4. The substances which give different colour indifferent medium and thus indicate the presence of acid or base in a solution are called _______
  1.    dye
  2.    indicator
  3.    reagent
  4.    chemical
 Discuss Question
Answer: Option B. -> indicator
Question 5. What is a galvanic (voltaic) cell?
  1.    It is a cell that destroys electrons on one side and creates electrons on the other side.
  2.    It is a cell that contains only one metal bar and one aqueous ion solution.
  3.    It is a type of battery that drives a redox reaction when electricity is applied.
  4.    It is a type of battery that generates an electrical current from redox reactions.
 Discuss Question
Answer: Option D. -> It is a type of battery that generates an electrical current from redox reactions.
Question 6. An electroanalytical / electrochemical techniques uses ________
  1.    working electrode
  2.    reference electrode
  3.    both reference and working electrodes
  4.    working, reference and counter electrodes
 Discuss Question
Answer: Option B. -> reference electrode
Question 7. What is a half-reaction?
  1.    It is a reaction at equilibrium where half of the substances are reactants and half of the substances are products.
  2.    It is the reaction that occurs when the switch of a galvanic cell is open.
  3.    It shows EITHER the reduction component or the oxidation component of a redox reaction.
  4.    It shows BOTH the reduction and oxidation components of a redox reaction.
 Discuss Question
Answer: Option C. -> It shows EITHER the reduction component or the oxidation component of a redox reaction.
Question 8. Oxidation occurs at the
  1.    anode
  2.    cathode
 Discuss Question
Answer: Option A. -> anode
Question 9. What occurs to the mass of copper electrode in the following reaction?Zn/Zn2+ // Cu2+/Cu
  1.    increases
  2.    decreases
  3.    remains the same
  4.    None of these
 Discuss Question
Answer: Option A. -> increases
Question 10. WHICH WAY DO THE ELECTRON FLOW IN A GALVANIC CELL
  1.    NEGATIVE TO POSITIVE TERMINAL
  2.    ANODE TO CATHODE
  3.    POSITIVE TO NEGATIVE TERMINAL
  4.    Both A & B
 Discuss Question
Answer: Option D. -> Both A & B

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