Electrochemistry
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Questions and Answers

What is the characteristic of metals with standard reduction potential values near about – 2.0 volt or more?

  • They have high positive reduction potentials
  • They are poor reducing agents
  • They are strongly electropositive (correct)
  • They are highly electronegative

    • What happens to the tendency of metals to liberate hydrogen gas from dilute acids as you descend in the electrochemical series?

  • It becomes constant
  • It remains the same
  • It decreases (correct)
  • It increases

    • Which of the following metals can liberate hydrogen from water?

  • Iron and the metals above it (correct)
  • Copper and metals above it
  • Iron and metals below it
  • Mercury and metals below it

    • What is the direction of the oxidation reaction in the equation Mn → Mn⁺⁺ + ne⁻?

    <p>Left to right</p> Signup and view all the answers

    What is the relationship between the reduction potential of a metal and its ability to displace hydrogen from dilute acids?

    <p>Metals with high negative reduction potentials can displace hydrogen</p> Signup and view all the answers

    What happens to the thermal stability of the oxide of a metal as you descend in the electrochemical series?

    <p>It decreases</p> Signup and view all the answers

    What is the tendency of non-metals with high positive values of standard reduction potentials?

    <p>To accept electrons readily</p> Signup and view all the answers

    Which of the following metals is a strong reducing agent?

    <p>Al</p> Signup and view all the answers

    What is the direction of the electrochemical series?

    <p>From top to bottom, increasing tendency to lose electrons</p> Signup and view all the answers

    What is the relationship between standard free energy change and cell potential?

    <p>ΔG = -nF × Ecell</p> Signup and view all the answers

    Which of the following metals has a moderate electropositive character?

    <p>Al</p> Signup and view all the answers

    What is the oxidation reaction in the electrochemical series?

    <p>M → M+ + e-</p> Signup and view all the answers

    Which of the following metals has a more negative reduction potential?

    <p>Sodium</p> Signup and view all the answers

    What is the principle behind the extraction of metals like Ag and Au from their salt solutions?

    <p>More electropositive metals can displace less electropositive metals</p> Signup and view all the answers

    Which of the following metals is NOT an alkali or alkaline earth metal?

    <p>Zinc</p> Signup and view all the answers

    What happens when metals below copper in the electrochemical series are heated?

    <p>They form unstable oxides that decompose on heating</p> Signup and view all the answers

    Which of the following is a stronger reducing agent?

    <p>Sodium</p> Signup and view all the answers

    What is the relationship between the reduction potential of a metal and its reducing power?

    <p>More negative reduction potential means stronger reducing power</p> Signup and view all the answers

    What is the relationship between the electrochemical equivalent (Z) of an element and its equivalent weight (E)?

    <p>E is directly proportional to Z</p> Signup and view all the answers

    What is the Faraday constant (F) equivalent to?

    <p>Charge on an electron × Avogadro's number</p> Signup and view all the answers

    How many moles of electrons are required to liberate one mole of monovalent cation?

    <p>One mole of electrons</p> Signup and view all the answers

    What is the unit of Faraday constant (F)?

    <p>Coulomb per mole</p> Signup and view all the answers

    What is the number of Faraday equivalent to?

    <p>Number of electrons passed</p> Signup and view all the answers

    What type of conductors are copper, silver, and tin?

    <p>Metallic conductors</p> Signup and view all the answers

    What is the relationship between the mass of a substance deposited or liberated at an electrode and the quantity of electricity passed?

    <p>They are directly proportional</p> Signup and view all the answers

    What is the charge carried by one mole of electrons?

    <p>96,500 Coulombs</p> Signup and view all the answers

    What is the electrochemical equivalent (ECE) of an ion?

    <p>A constant that depends on the ion</p> Signup and view all the answers

    What is the relationship between the amount of electricity involved in a reaction and the number of moles of electrons involved?

    <p>Q = nF</p> Signup and view all the answers

    What is the quantity of electricity involved in a reaction when one mole of electrons is involved?

    <p>96,500 Coulombs</p> Signup and view all the answers

    What is the unit of electrochemical equivalent (ECE)?

    <p>Grams per Coulomb</p> Signup and view all the answers

    What is the unit of electrochemical equivalent?

    <p>gram per coulomb</p> Signup and view all the answers

    What is the number of electrons in 1 mole of electrons?

    <p>6.023 × 10^23</p> Signup and view all the answers

    What is the value of Faraday's constant in Coulombs?

    <p>96500</p> Signup and view all the answers

    What is the charge of one electron in Coulombs?

    <p>1.6 × 10^-19</p> Signup and view all the answers

    What is the relationship between the amount of substance and the quantity of electricity passed in Faraday's law of electrolysis?

    <p>The amount of substance is directly proportional to the quantity of electricity passed</p> Signup and view all the answers

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