15 electrochemistry MCQ1
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Questions and Answers

What is the primary function of an electrode in an electrochemical reaction?

  • To catalyze a chemical reaction
  • To store electrical energy
  • To measure the potential difference between two solutions
  • To conduct electricity and facilitate electron transfer (correct)

    • What is the characteristic of an active anode in an electrochemical reaction?

  • It remains unchanged during the reaction
  • It gradually dissolves as the reaction proceeds (correct)
  • It is only used in electrolysis reactions
  • It is only used in displacement reactions

    • In an electrolysis reaction, what occurs at the cathode?

  • Reduction occurs, resulting in a gain of electrons (correct)
  • The electrolyte is formed
  • The electric current is generated
  • Oxidation occurs, resulting in a loss of electrons

    • What is the purpose of the electrochemical series?

    <p>To arrange metals in order of their reactivity</p> Signup and view all the answers

    What is the result of electrolysis of an aqueous solution of copper dichromate?

    <p>A blue color appears at the cathode and a yellow color appears at the anode</p> Signup and view all the answers

    What is the function of the electrolyte in an electrolysis reaction?

    <p>To provide a path for the ions to move</p> Signup and view all the answers

    What is the outcome of a displacement reaction between zinc granules and acidified copper sulfate solution?

    <p>Zinc dissolves and copper is deposited</p> Signup and view all the answers

    What is the significance of the memory aid 'CatNAP'?

    <p>It helps to remember the signs of oxidation and reduction</p> Signup and view all the answers

    What is the result of electrolysis of an aqueous solution of sodium sulfate using a universal indicator?

    <p>The solution turns acidic</p> Signup and view all the answers

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