Multiple Choice Questions

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

Multiple Choice Questions
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