How about another Chemistry Question on Redox Reactions as a food for thoughts over the weekend...

Q) Which of the following conversions is a redox reaction (involves oxidation/reduction)?

A)H+ => H20

B)NO2 => NO3^-

C)SO2 => SO3^2-

D)SO3 => SO4^2-

Enjoy and take care.

Rgds,

Sean

SimpleChemConcept

## Saturday, September 29, 2007

### Chemistry Questions - Redox Reaction

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## 2 comments:

I'll give this question a try.

A)H+ => H20

The oxidation state(number) of H is +1. To find the oxidation state of H in H2O, form eqn: 2H + (-2) = 0

Hence, oxidation state of H in H2O is +1.

A is not the answer.

B)NO2 => NO3^-

Find the oxidation state of N in NO2 and NO3^-.

Eqn: N + (-2 X 2) = 0

N in NO2 = +4

Eqn: N + (-2 X 3) = -1

N in NO3^- = +5

This could be the answer.

C)SO2 => SO3^2-

Find the oxidation state of S in SO2 and SO3^2-.

Eqn: S + (-2 X 2) = +4

S in SO2 = +4

Eqn: S + (-2 X 3) = -2

S in SO3^- = +4

C is not the answer.

D)SO3 => SO4^2-

Similarly, we will get +6 for S in both SO3 and SO4^2-

So.... (B) is the answer.

Well Done Zhengning! You are Right!

This is exatly the approach in answering such question testing on the Oxidation States/Numbers.

Do share this with your friends, siblings and peers alike.

PS: Good for you to type out the detailed working and share with all.

Sean

SimpleChemConcepts

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