In the previous post, we talked about the oxidation state and the rules for their determination. In short, you need to know, or have the table, for the standard oxidation states, and determine the unknowns.
Keep in mind, that in neutral molecules, the sum of the oxidation states must be zero, and for ions, it must be equal to the ionic charge:
1.
Determine the oxidation states in the following species:
a)
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b)
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c)
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d)
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e)
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f)
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g)
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h)
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i)
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j)
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k)
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l)
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m)
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n)
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o)
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p)
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q)
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r)
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s)
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t)
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u)
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v)
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w)
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x)
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y)
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z)
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2.
Does the oxidation state of phosphorus vary in Ca3(PO4)2, Na3PO4 and PO43- ?
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3.
What is the oxidation state of H2 in H2(g)?
Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)
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4.
In which of the following does chlorine have an oxidation state of +3?
A) HClO3
B) Cl2O7
C) HClO2
D) NH4Cl
E) HClO
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5.
In the reaction 2Na(s) + Cl2(g) → 2NaCl(s), Cl2 is:
A) oxidized
B) the oxidizing agent
C) the reducing agent
D) the electron donor
E) none of these
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6.
In the following reaction, Cu2+(aq) is:
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
A) oxidized
B) reduced
C) the electron donor
D) the reducing agent
E) two of these
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7.
In the reaction N2(g) + 3H2(g) → 2NH3(g), hydrogen is
A) oxidized
B) reduced
C) the electron donor
D) none of these
E) two of these
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8.
Which species is the oxidizing agent in the reaction P4(s) + 10Cl2(g) → 4PCl5(s)?
A) PCl5
B) chlorine
C) phosphorus
D) Cl–
E) none of these
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9.
In the reaction C(s) + O2(g) → CO2(g) carbon is __________.
A) the electron acceptor
B) the electron donor
C) reduced
D) the oxidizing agent
E) none of these
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10.
Which of the following is not an oxidation-reduction reaction?
A) C3H8 + 5O2 → 3CO2 + 4H2O
B) Mg + 2HCl → MgCl2 + H2
C)2Li + 2H2O → 2LiOH + H2
D) BaCO3 + HCl → BaCl2 + CO2 + H2O
E) None of these
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11.
Identify the reaction where the oxidation number of oxygen increases.
A) HCl (aq) + Ba(OH)2 (aq) → BaCl2 (aq) + H2O (l)
B) AgNO3(aq) + K2SO4 (aq) → Ag2SO4 (s) + 2KNO3 (aq)
C) CaO (s) + H2O (l) → Ca(OH)2 (s)
D) H2O2 (l) → H2 (g) + O2 (g)
E) 2NO (g) + O2 (g) → 2NO2 (g)
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12.
Identify the reaction where the oxidation number of hydrogen changes.
A) HCl (aq) + KOH (aq) → KCl (aq) + H2O (l)
B) FeO (s) + H2O (l) → Fe(OH)2 (s)
C) 2Li (s) + 2H2O (l) → 2LiOH (aq) + H2 (g)
D) 2HClO4(aq) + MgCO3 (s) → Mg(ClO4)2 (aq) + H2O (l) + CO2 (g)
E) SO3(g) + H2O (l) → H2SO4 (aq)
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13.
Which of the following is an oxidation-reduction reaction?
A) AgNO3(aq) + KBr(aq) → AgBr(s) + KNO3(aq)
B) HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
C) Zn(s) + 2Co(NO3)2(aq) → 2Co(s) + Zn(NO3)2(aq)
D) C2H3O2H(aq) + 2NaOH(aq) → NaC2H3O2(aq) + H2O(l)
E) Na2CO3(aq) + Mg(NO3)2(aq) → 2HNO3(aq) + MgCO3(s)
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