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Oxidation-Reduction
Test Description: Regents Chemistry Exam review questions based on redox chemistry and electrochemical cells
Instructions: Answer all questions to get your test result.
1) Which half-reaction correctly represents a reduction reaction?
A
Na^0 + e- --> Na+
B
Br2^0 + 2e- --> 2Br-
C
Li^0 + e- --> Li+
D
Sn^0 + 2e- --> Sn^2+
2) Given the reaction: 2Na +2H2O --> 2Na+ + 2OH- + H2. which substance is oxidized?
A
Na+
B
H+
C
Na
D
H2
3) Which change occures when an Sn^2+ ion is oxidized?
A
Two electrons are gained
B
Two protons are lost.
C
Two electrons are lost.
D
Two electrons are gained.
4) Which equation represents a redox reaction?
A
NH3 + H+ + Cl- --> NH4^+ + Cl-
B
2Na+ + S^2- --> Na2S
C
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
D
H+ + C2H3O2 --> HC2H3O2
5) In an electrolytic cell, to which electrode will a positive ion migrate and undergo reduction?
A
the anode, which is negatively charged
B
the cathode, which is positively charged
C
the cathode, which is negatively charged
D
the anode, which is positively charged
6) In which compound does sulfur have an oxidation number of -2?
A
Na2SO4
B
SO2
C
SO3
D
Na2S
7) In an electrolytic cell, oxidation takes place at the
A
anode, which is positive
B
anode, which is negative
C
cathode, which is negative
D
cathode, which is positive
8) Which half-reaction correctly represents reduction?
A
Fe^2+ + 2e- --> Fe^0
B
Fe^0 + 2e- -->Fe^2+
C
Fe^0 + e- --> Fe^3+
D
Fe^2+ + e- --> Fe^3
9) Which redox equation is correctly balanced?
A
Al^3+ + K --> Al + K+
B
Br2 +Hg --> Hg^2+ + 2Br-
C
Sn^4+ + H2 --> Sn +2H+
D
Cr^3+ + Mg --> Cr + Mg^2+
10) Given the reaction: Ca(s) + Cu^2+(aq) --> Ca^2+(aq) + Cu(s). What is the correct reduction half-reaction?
A
Cu(s) --> Cu^2+(aq) + 2e-
B
Cu^2+(aq) --> Cu(s) + 2e-
C
Cu(s) + 2e- --> Cu^2+(aq)
D
Cu^2+(aq) + 2e- --> Cu(s)
*select an answer for all questions
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