# Oxidation Numbers: Question Preview (ID: 14558)

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**What is the oxidation number of Chlorine in HClO4?**

a) +1

b) +5

c) +3

d) +7

**The number of nitrogen in N2 is**

a) +1

b) 0

c) +3

d) -3

**What is the oxidation number of Pt in K2PtCl6?**

a) -2

b) +2

c) -4

d) +4

**What is the oxidation number of sulfur in H2SO4?**

a) 0

b) -2

c) +6

d) +4

**What is the oxidation number of nitrogen in (NO3)-1**

a) +1

b) +3

c) +5

d) -5

**The oxidation number of nitrogen in N2O is**

a) +1

b) +2

c) -1

d) -2

**The oxidation number of manganese in KMnO4 is**

a) +1

b) +7

c) +3

d) +4

**Oxygen has an oxidation number of -2 in**

a) O2

b) NO2

c) Na2O2

d) OF2

**What is the sum of the oxidation numbers in CO2?**

a) 0

b) -2

c) -4

d) +4

**What is the oxidation number of Cr in the dichromate ion (Cr2O7)-2**

a) +1

b) +3

c) +5

d) +6

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