Oxidation-Reduction: Question Preview (ID: 6448)

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In which compound does sulfur have an oxidation number of -2?
a) SO2
b) SO3
c) Na2S
d) Na2SO4

In an electrolytic cell, to which electrode will a positive ion migrate and undergo reduction?
a) the anode, which is negatively charged
b) the anode, which is positively charged
c) the cathode, which is negatively charged
d) the cathode, which is positively charged

Which equation represents a redox reaction?
a) 2Na+ + S^2- --> Na2S
b) H+ + C2H3O2 --> HC2H3O2
c) NH3 + H+ + Cl- --> NH4^+ + Cl-
d) Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-

Which change occures when an Sn^2+ ion is oxidized?
a) Two electrons are lost.
b) Two electrons are gained
c) Two protons are lost.
d) Two electrons are gained.

Given the reaction: 2Na +2H2O --> 2Na+ + 2OH- + H2. which substance is oxidized?
a) H2
b) Na+
c) Na
d) H+

Which half-reaction correctly represents a reduction reaction?
a) Sn^0 + 2e- --> Sn^2+
b) Br2^0 + 2e- --> 2Br-
c) Li^0 + e- --> Li+
d) Na^0 + e- --> Na+

In an electrolytic cell, oxidation takes place at the
a) anode, which is positive
b) anode, which is negative
c) cathode, which is positive
d) cathode, which is negative

Which half-reaction correctly represents reduction?
a) Fe^2+ + 2e- --> Fe^0
b) Fe^2+ + e- --> Fe^3
c) Fe^0 + 2e- -->Fe^2+
d) Fe^0 + e- --> Fe^3+

Which redox equation is correctly balanced?
a) Cr^3+ + Mg --> Cr + Mg^2+
b) Al^3+ + K --> Al + K+
c) Sn^4+ + H2 --> Sn +2H+
d) Br2 +Hg --> Hg^2+ + 2Br-

Given the reaction: Ca(s) + Cu^2+(aq) --> Ca^2+(aq) + Cu(s). What is the correct reduction half-reaction?
a) Cu^2+(aq) + 2e- --> Cu(s)
b) Cu^2+(aq) --> Cu(s) + 2e-
c) Cu(s) + 2e- --> Cu^2+(aq)
d) Cu(s) --> Cu^2+(aq) + 2e-

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