MCQ Questions
Q.1.
Which best identifies why the rusting of an iron nail in the presence of water and oxygen is an oxidation-reduction reaction?
  • 0%
    Electrons are transferred.
  • 0%
    This is a redox reaction in which octane (C8H18) is oxidized.
  • 100%
    the loss of electrons
  • 0%
    the substance that is reduced because it gains electrons
Q.2.
Consider the following reaction.Co2(g) + H2(g) = CO(g) + H2O(l)What is being oxidized?
  • 0%
    oxygen
  • 100%
    hydrogen
  • 0%
    carbon
  • 0%
    ionic
Q.3.
Given the reaction below, which is the oxidized substance?Mg + Cl2 Mg2+ + 2Cl
  • 0%
    hydrogen
  • 0%
    Cl2
  • 100%
    Mg
  • 0%
    H2
Q.4.
Which identifies an oxidation-reduction reaction?
  • 0%
    a reaction in which oxidation numbers change
  • 100%
    In a redox reaction, an electron is lost by the reducing agent.
  • 0%
    a decomposition reaction in which a metal is reduced
  • 0%
    the substance that is reduced because it gains electrons
Q.5.
The presence of which reactant is the best indicator of an oxidation-reduction reaction?
  • 0%
    Mg
  • 0%
    H2
  • 0%
    Cl2
  • 100%
    hydrogen
Q.6.
Given the reaction below, which is the reduced substance?Mg + Cl2 Mg2+ + 2Cl
  • 0%
    Cl102
  • 0%
    Cl10
  • 0%
    Cl0
  • 100%
    Cl2
Q.7.
In the redox reaction below, which is the reducing agent?MnO2 (s) + 4H+(aq) + 2Cl (aq) Mn2+(aq) + 2H2O(l) + Cl2(g)CI-
  • 0%
    Na+
  • 0%
    Cl-
  • 0%
    Clo2-
  • 100%
    Ca2+
Q.8.
Which type of reaction occurs in the following?2HgO(s) 2Hg(l) + O2(g)
  • 0%
    a decomposition reaction in which a metal is reduced
  • 100%
    a reaction in which oxidation numbers change
  • 0%
    the substance that is reduced because it gains electrons
  • 0%
    In a redox reaction, an electron is lost by the reducing agent.
Q.9.
Which answer best describes what is happening in the following reaction?2C8H18 + 25O2 16CO2 + 18H2O
  • 0%
    This is a redox reaction in which octane (C8H18) is oxidized.
  • 100%
    Electrons are transferred.
  • 0%
    In a redox reaction, an electron is lost by the reducing agent.
  • 0%
    the substance that is reduced because it gains electrons
Q.10.
Which of the following is true about a redox reaction?
  • 0%
    In a redox reaction, an electron is lost by the reducing agent.
  • 100%
    the loss of electrons
  • 0%
    ZnS(s) + 2O2(g) ZnSO4(s)
  • 0%
    the substance that is reduced because it gains electrons