Unit 11: Redox: Question Preview (ID: 6617)


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Write the oxidation state for each of the elements in cryolite, Na3AlF6:
a) +1, +3, -1 b) +3, +3, -6 c) +1, -3, -1 d) +1, +3, -6
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) anode, which is negative
In the reaction: 2H2(g) + O2(g) --> 2H2O(g), the oxidizing agent is
a) H2 b) O2 c) H- d) O2-
Which statement best describes the reaction represented by the equation:2NaCl + 2H2O + electricity --> Cl2 + H2 + 2NaOH
a) The reaction occurs in a voltaic cell and releases energy. b) The reaction occurs in a voltaic cell and absorbs energy. c) The reaction occurs in an electrolytic cell and releases energy. d) The reaction occurs in an electrolytic cell and absorbs energy.
What is the oxidation number of iodine in NaIO3?
a) +1 b) +5 c) +3 d) +6
Which species acts as the anode when the reaction Zn(s) + Pb2+(aq) --> Zn2+(aq) + Pb(s) occurs in an electrochemical cell?
a) Zn(s) b) Zn2+(aq) c) Pb2+(aq) d) Pb(s)
The oxidation number of a reducing agent can change from
a) -1 to -3 b) -2 to -1 c) 3 to -1 d) 4 to -3
In the reaction: Pb + 2Ag+ --> Pb2+ + 2Ag, the Ag+ is:
a) reduced, and the oxidation number changes from +1 to 0 b) reduced, and the oxidation number changes from +2 to 0 c) oxidized, and the oxidation number changes from 0 to +1 d) oxidized, and the oxidation number changes from +1 to 0
Which is the balanced half-reaction equation for the reduction of Al3+ to Al?
a) Al3+ + 3e- → Al b) Al3+ → Al + 3e- c) Al + 3e- → Al3+ d) Al → Al3+ + 3e-
In a voltaic cell,reduction occures at:
a) the anode which is negative b) the anode which is positive c) the cathode which is negative d) the cathode which is positive
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