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WorksheetsRedox Review Part 1
Total questions: 40
Worksheet time: 56mins
What is the oxidation number of chlorine in ClO3-1 ?
-1
+1
-1
+5
Which of the following is NOT a redox reaction?
Single Replacement
Decomposition
Synthesis
Double Replacement
Combustion
According to Table J, which of the following elements will oxidize most easily?
Chlorine
Aluminium
Hydrogen
Lithium
What is the oxidation state of sulphur in SO42- (aq)?
4
6
2
0
What is the oxidation state of Nitrogen in N2 (g)?
4
6
2
0
Substances that lose electrons easily and are oxidized in a chemical reaction are ____________.
reducing agents
oxidizing agents
neutralizing agents
analytical agents
What is the oxidation number of Nitrogen in HNO3
-7
-5
+5
+7
+2
Identify the species reduced in the following reaction.
Fe(s) + 2 Ag+(aq) → Fe2+(aq) + 2 Ag(s)
Fe
Ag
none of these
None of the above
Find the oxidation number of Ca in CaH2
-2
-4
+2
+4
0
Identify the substance that is reduced in the reaction between copper(II) ion and magnesium.
Cu2+ + Mg → Cu + Mg2+
Cu2+
Mg
Cu
Mg2+
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
loses electrons and is the oxidizing agent
loses electrons and is the reducing agent
gains electrons and is the reducing agent
Mg → Mg2+ + 2e–
Which of the following half reactions correctly represents a reduction half reaction?
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
Identify the reducing agent in the reaction between sulfuric acid and zinc.
H2SO4 + Zn → H2 + ZnSO4
H2SO4
Zn
H2
ZnSO4
In the reaction
4 NH3 + 5 O2 → 4 NO + 6 H2O
the oxidation number of nitrogen changes from
–2 to –3
–2 to +3
–3 to –2
–3 to +2
What is the oxidation number of chromium in K2Cr2O7 ?
+12
+2
+3
+6
In which substance does hydrogen have an oxidation number of zero?
LiH
H2O
H2S
H2
In which substance is the oxidation number of Cl equal to +1?
Cl2
Cl2O
AlCl3
HClO2
In which compound does hydrogen have an oxidation state of –1?
NaH
HCl
H2O
NH3
Oxygen has an oxidation number of –2 in
O2
NO2
Na2O2
OF2
Given the reaction:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
The oxidation number of Zn(s) increases because it
loses electrons
gains electrons
loses protons
gains protons
Which change in oxidation number represents reduction?
–1 to +1
–1 to –2
–1 to +2
–1 to 0
Given the oxidation-reduction reaction:
H2 + 2 Fe+3 → 2 H+ + 2 Fe+2
Which species undergoes reduction?
H2
Fe3+
H+
Fe2+
In the reaction
2 Fe3+ + S2– → 2 Fe2+ + S0,
the species oxidized is
Fe3+
S2–
Fe2+
S0
In the reaction
2 Mg + O2 → 2 MgO
the magnesium is the
oxidizing agent and is reduced
oxidizing agent and is oxidized
reducing agent and is reduced
reducing agent and is oxidized
Given the redox reaction:
Fe2+(aq) + Zn(s) → Zn2+(aq) + Fe(s)
Which species acts as a reducing agent?
Fe(s)
Fe2+(aq)
Zn(s)
Zn2+(aq)
Which half-reaction correctly represents oxidation?
Sn2+ + 2e– → Sn0
Sn4+ + 2e– → Sn2+
Sn2+ → Sn0 + 2e–
Sn2+ → Sn4+ + 2e–
Which balanced equation represents an oxidation-reduction reaction?
AgNO3 + NaCl → AgCl + NaNO3
BaCl2 +K2CO3 → BaCO3 +2KCl
CuO + CO → Cu + CO2
HCl + KOH → KCl + H2O
Which balanced equation represents an oxidation-reduction reaction?
Ba(NO3)2 + Na2SO4 →BaSO4 + 2NaNO3
H3PO4 + 3KOH →K3PO4 + 3H2O
Fe(s) + S(s) →FeS(s)
NH3(g) + HCl(g) →NH4Cl(s)
Au (s) + HCl (l) →
Br2 (l) + KI (aq) →
Br2 + NaF ->
Li + NaF ->
Will this reaction happen if solid copper is dipped into a solution of zinc nitrate? In other words will Cu react with Zn+2?
Yes
No
Zinc was placed into copper nitrate solution. Based on the picture, which is more active, copper or zinc?
copper
zinc
sulfate
they are equally reactive
___ Al + ___ Fe+2 → ___ Al+3 + ___ Fe
Balance the following redox equations for reactions that occur in neutral solution:
Fe3+ + I− → Fe2+ + I2. :
Fe3+ + 2I− → Fe2+ + 2I2
Fe3+ + I− → Fe2+ + I2
2Fe3+ + I− → 2Fe2+ + I2
2Fe3+ + 2I− → 2Fe2+ + I2
Balance the following redox equations for reactions that occur in neutral solution:
Zn + Ag+ → Zn2+ + Ag
Zn + 2Ag+ → Zn2+ + 2Ag
Zn + Ag+ → Zn2+ + Ag
Zn + 2Ag+ → Zn2+ + Ag
Zn+ Ag+ → 2 Zn2+ + 2Ag
