You are Here: Home

# Oxidation Numbers

Chemistry discussion, revision, exam and homework help.

Announcements Posted on
Find out how cards are replacing warnings on TSR...read more 03-12-2013
1. Oxidation Numbers
In a january 2012 paper, the question was:

What is the oxidation number of oxygen in OF2?
A -2
B -1
C +1
D +2

The answer was B, -1. Please can someone explain this to me?
2. Re: Oxidation Numbers
Are you sure it is B? Every way I think of this is O = -2 and F=+1. I was told Oxygen is always -2 unless it is in O2
3. Re: Oxidation Numbers
(Original post by JRSmith29395)
In a january 2012 paper, the question was:

What is the oxidation number of oxygen in OF2?
A -2
B -1
C +1
D +2

The answer was B, -1. Please can someone explain this to me?
The anwer given is incorrect. The oxidation number should be +2, D
4. Re: Oxidation Numbers
(Original post by charco)
The anwer given is incorrect. The oxidation number should be +2, D
D: not -2? Is this due to the electronegativity of F being the highest possible?
5. Re: Oxidation Numbers
(Original post by Stickyelmo)
D: not -2? Is this due to the electronegativity of F being the highest possible?
yes
6. Re: Oxidation Numbers
(Original post by Stickyelmo)
D: not -2? Is this due to the electronegativity of F being the highest possible?
No. Fluorine will always be -1, so oxygen in F2O would be +2.
7. Re: Oxidation Numbers
(Original post by JRSmith29395)
In a january 2012 paper, the question was:

What is the oxidation number of oxygen in OF2?
A -2
B -1
C +1
D +2

The answer was B, -1. Please can someone explain this to me?

yeah its wrong. The oxidation number oxygen in OF2 is +2

Try checking the question again too. Because if its asking for fluorine then the answer will indeed be -1
Last edited by bluemax; 19-04-2012 at 18:37.
8. Re: Oxidation Numbers
(Original post by Alofleicester)
No. Fluorine will always be -1, so oxygen in F2O would be +2.
I thought oxygen was always -2 except in peroxides?
9. Re: Oxidation Numbers
(Original post by JRSmith29395)
I thought oxygen was always -2 except in peroxides?
Or when it's bound to fluorine
10. Re: Oxidation Numbers
(Original post by illusionz)
Or when it's bound to fluorine
oh right thanks

## Step 2: Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank

this is what you'll be called on TSR

2. this can't be left blank

never shared and never spammed

3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. By completing the slider below you agree to The Student Room's terms & conditions and site rules

2. Slide the button to the right to create your account

You don't slide that way? No problem.

Last updated: April 19, 2012
Useful resources
Study resources