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WorksheetsHigher Chemistry - Unit 1 - Oxidising and Reducing Agents
Total questions: 14
Worksheet time: 37mins
Name
Class
Date
1.
What is the species that lose electrons in a redox reaction?
a)
oxidizing agent
b)
reducing agent
c)
is reduced
d)
decreases in oxidation number
2.
What is the species that gain electrons in a redox reaction?
a)
oxidizing agent
b)
reducing agent
c)
is oxidized
d)
increases in oxidation number
3.
What is the oxidizing agent of this reaction?
3Mg + N2−−−−> Mg3N2
3Mg + N2−−−−> Mg3N2
a)
Mg
b)
N2
c)
Mg3N2
d)
MgN
4.
What is the reducing agent of this reaction?
3Mg + N2−−−−> Mg3N2
3Mg + N2−−−−> Mg3N2
a)
Mg
b)
N2
c)
Mg3N2
d)
MgN
5.
What is the reducing agent of this reaction?
2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)
2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)
a)
H+
b)
Al3+
c)
Al
d)
H2
6.
What is the oxidizing agent of this reaction?
2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)
2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)
a)
H2
b)
Al3+
c)
Al
d)
H+
7.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
8.
Which half-reaction correctly represents reduction reaction?
a)
Br- + 2e- −−−>Br2
b)
Mn2+ + e- −−−>Mn
c)
Ag+ + 2e- −−−>Ag
d)
Cu2+ + 2e- −−−>Cu
9.
Which half-reaction correctly represents oxidation reaction?
a)
Mg −−−>Mg2+ + 3e-
b)
Zn −−−>Zn2+ + 2e-
c)
Ag−−−>Ag+ + 2e-
d)
Li −−−>Li+ + 2e-
10.
Which species undergoes a gain of electrons?
Zn(s) + Mg2+(aq) −−−> Zn2+(aq) + Mg (s)
Zn(s) + Mg2+(aq) −−−> Zn2+(aq) + Mg (s)
a)
Zn
b)
Mg2+
Fe2+
Fe2+
c)
Zn2+
d)
Mg
11.
What is the colour change of acidified KMnO4(aq) solution when serving as oxidizing agent?
a)
From green to orange
b)
From orange to green
c)
From purple to colourless
d)
From colourless to purple
12.
Oxidation is the _________ of electrons.
a)
loss
b)
gain
c)
sharing
d)
transfer
13.
Reduction is the ___________ of electrons.
a)
loss
b)
gain
c)
sharing
d)
transfer
14.
What colour is copper (II) oxide
a)
white
b)
green
c)
blue
d)
black
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