R Chem
Redox Rev MC
1. ln which compound does chlorine have the
7. ln an oxidation-reduction
highest oxidation number?
defined as the
(1) NaCIO
(2) NaClo,
(3) NaClo,
(1) loss of protons (3) loss of electrons
(2) gain of protons (4) gain of electrons
8.
(4) NaClOo
2.
Chlorine has an oxidation state of *3 in the
compound
(1) HClo
(2) HC1O2
3.
(3) HCIO3
(4) HCIO4
atoms become negative nonmetal ions?
(1) oxidation
(2) reduction
Given the reaction that occurs in an
electrochemical cell:
During this reaction, the oxidation number of Zn
changes from
(3) +2 to 0
(1) 0 to +2
(2) 0to -2
(4) -2to
0
What is the oxidation number of oxygen in OFr?
(1) +1
(2) +2
(3) -1
(4) -2
5. In which compound does hydrogen have
In a redox reaction, there is a conservation of
(1) mass, only
(2) charge, only
(3) both mass and charge
(4) neither mass nor charge
9. Which type of reaction occurs when nonmetal
Zn(s) + CuSOo(aq) -+ ZnSOo(aq) + Cu(s)
4.
reaction, reduction is
a
10.
(3) substitution
(4) condensation
What occurs during the reaction below?
4 HCI + MnO2
-;
MnCl, + 2H2O + Clz
(1) The manganese is reduced and its oxidation
number changes from +4 to +2.
(2) The manganese is oxidized and its oxidation
number changes from +4 to +2.
(3) The manganese is reduced and its oxidation
number changes from +2 to +4.
(a) The manganese is oxidized and its oxidation
number changes from +2 to +4.
11. Given the redox reaction:
negative oxidation number?
(1) CaH2
(2) H3PO4
6. Half-reactions
(
1
2 Cr(s) + 3 Sn2+(aq)
(3) NaoH
(4) NH3
can be written to represent
) double-replacement reactions
(2) neutrali zation reactions
(3) fission and fusion reactions
(4) oxidation and reduction reactions
all
-+2 Ct'.(aq) + 3 Sn(s)
Which species serves as the reducing agent?
(1) Cr
(3) Ct'+
(2) Sn2*
(a) Sn
12. Base your
answer to the following question on
the diagram of a chemical cell and the equation
below. The reaction occurs at 1 atmosphere and
298 K.
14. Given the reaction:
Zn(s) + 2HCl(aq) aZnClr(aq) + Hz(g)
Which substance is oxidized?
(1)
(2)
(3)
(4)
Zn(s)
Hcl(aq)
cl1aq)
rf(aq)
15. Base your answer to the following question on
the diagram of the chemical cell at 298Kand on
the equation below.
Pb(s) + Cu2 + (aq)
---+
Pb2
* (aq) + Cu(s)
Which change occurs when the switch is closed?
(1) Pb is oxidized, and electrons flow to the Cu
electrode.
(2) Pb is reduced, and electrons flow to the Cu
electrode.
t.OMNi2+(oq) l.OMAg+(oq)
(3) Cu is oxidized, and electrons flow to the Pb
electrode.
Ni01s)
+
(a) Cu is reduced, and electrons flow to the Pb
2lg+(uq)
-
trtis*(aq)
+ 2eg0(s;
electrode.
13. In the reaction:
As the reaction in this cell takes place, the
concentration of Ni2* ions
(1) decreases and the concentration of Ag* ions
Clz+HzO -+ HC1O + HCl,
decreases
(2) decreases and the concentration of Ag* ions
the hydrogen is
(1) oxidized, only
(2) reduced, only
(3) both oxidized and reduced
(4) neither oxidized nor reduced
increases
(3) increases and the concentration of Ag* ions
decreases
(4) increases and the concentration of Ag* ions
increases
16. Which equation correctly represents reduction?
(1) Na+ + 1e- + Nao (3) Cl- + le- + Clo
(2) Na+ + Nao + le- (4) Cr + clo + le_
17. lnthe reaction
21. The equation below
represents the reaction for a
lead-acid battery.
2Na+ CLr-+2Na+ +2Cl-,
what species is oxidized?
Pb + Pbo, + 2Hnsoa
(1) Na
(2) Ctz
(3) Na+
(4)
cr
18. Given
3Ag+A*3*-+3Ag++Au
22.
Which equation correctly represents the
oxidation half-reaction?
19.
Which statement correctly describes the
oxidation and reduction that occur?
(1)
(2)
(3)
(a)
Co(s) is oxidized and Cl-(aq) is reduced
Co(s) is oxidized and Pb+2(aq) is reduced
Co(s) is reduced and Cl-(aq) is oxidized
Co(s) is reduced and Pb+2(aq) is oxidized
the gain of electrons, only
the loss of electrons, only
both the gain and the loss of electrons
neither the gain nor the loss of electrons
23. Which is a redox reaction?
(1) Ba2* + SO+2- -; BaSOo
(2) I{ + OH- -+ HrO
(3) Sno * Sn4* -s 2 Stf*
(4) H* + NH3 -+ NH+*
24. Which metal reacts spontaneously with a
solution containing zinc ions?
(1) magnesium
(3) copper
(2) nickel
(4) silver
20. Given the redox reaction:
Co(s) + PbClr(aq) -+ CoClr(aq) + Pb(s)
All redox reactions involve
(1)
(2)
(3)
(4)
Which half-reaction correctly represents a
reduction reaction?
(1) Sno + 2e- -+ Sn2*
(2) Nao + e -+ Na+
(3) Lio * e- -+ Li+
(4) Brro + 2e- -+ 2Pl{
zpbso4 + zHro
Which species is oxidized during the discharge
of the batlery?
(1) Pb
(3) PbSO4
(2) PbO2
(4) H2SO4
the reaction:
(1) 3Ag + 3e- -+ 3Ag*
(2) 3Ag-+ 3Ag* + 3e(3) Au3+ + 3e- -e Au
(4) Au3+ -+ Au + 3e-
+*B
charge
25. Under standard conditions, which metal will
react with 0.1 M HCl to liberate hydrogen gas?
(l) Ae
(2) Au
26.
(3) Cu
(a) Mg
According to Reference Table J, which
Md* to Mg(s)?
will
reduce
(1) Fe(s)
(2) Ba(s)
27.
(3) Pb(s)
(a) Ag(s)
According to Reference Table J, which metal
reduce Ni2* to Ni(s)?
will
(1) Fe(s)
(2) Cu(s)
(3) Ae(9
(a) Au(s)
28. Based on Reference Table J, which reaction will
take place spontaneously?
(1) Cu + 2l|' -+ Cu2- + H,
(2) 2 Au+ 6 H+ -+ 2 Au3* + 3 H2
(3) Pb +2I{, -; Pb2* + H,
32.
Base your answer to the following question on
the equation and diagram below represent an
electrochemical cell at298 K and 1 atmosphere.
g) 2 Ag+2H+ -+2 Ag+ +H,
29. Given the balanced equation:
2 Al(s) + 6 H+(aq)
e
2 Al3+(aq) + 3 Hr(g)
When 2 moles of Al(s) completely reacts, what
is the total number of moles of electrons
transferred from Al(s) to H+(aq)?
(1)
(2)
(3) 3
(4) 4
s
6
30. Given
the unbalanced equation:
_MnO2 + _HCl -+ _MnCl, + _H2O + _Clz
Mg(s) +2Ag+(aq)
+Mgz*(aq)
+2Ag(s)
When the equation is correctly balanced using
smallest whole number coefficients, the
coefficient of HCI is
(1) 1
(2) 2
31. Given
(3) 3
(4) 4
the reaction:
_Ct'* +
10
oH- +_Clor- -1 _Croo2- + _Cl- +
5 H2O
When the reaction is completely balanced using
fte slf4llest whole numbers, the coefficient of Cr
'- will be
(1) I
(2) 2
(3) 3
(4) 4
Which species is oxidized when the switch is
closed?
(1)
(2)
(3)
(a)
Me(O
Mg2" (aq)
AeG)
Ag+(aq)
33. The diagram below
represents a chemical cell.
35. Which
statement best describes the key?
Power source
In order for the ceil to operate, it should be
provided with
(1) a cathode
(2) ananode
(3) a salt bridge
(4) an extemal path for electrons
34. The diagram below shows a key being plated
with copper in an electrolytic cell
CUSOa(aq)
Given the reduction reaction for this cell:
Cu2*(aq) +2e-
-+ Cu(s)
This reduction occurs at
(l)
A, which
(2) A, which
(3) B, which
(4) B, which
is the anode
is the cathode
is the anode
is the cathode
Key
(1)
(2)
(3)
(4)
silver
It acts as the cathode and is negative.
It acts as the cathode and is positive.
It acts as the anode and is negative.
It acts as the anode and is positive.