Comments on: O Level Chemistry Question: Redox Reaction http://www.simplechemconcepts.com/chemistry-questions-redox-reaction/ Chemistry Made Easy Fri, 23 Jul 2010 03:40:12 -0500 http://wordpress.org/?v=2.8.4 hourly 1 By: IGCSE Student http://www.simplechemconcepts.com/chemistry-questions-redox-reaction/comment-page-1/#comment-2378 IGCSE Student Thu, 11 Jun 2009 20:50:57 +0000 http://simplechemconcepts.com/2007/09/29/chemistry-questions-redox-reaction/#comment-2378 Thanks alot Zhengning!! I have an exam tomorrow , and I was still confused with redox reactions involving covalent bonds until I read your solution. I am relieved now as I am more confident in solving them and also because The Sean has confirmed it. Thanks again... Thanks alot Zhengning!!
I have an exam tomorrow , and I was still confused with redox reactions involving covalent bonds until I read your solution. I am relieved now as I am more confident in solving them and also because The Sean has confirmed it.
Thanks again…

]]> By: Sean Chua http://www.simplechemconcepts.com/chemistry-questions-redox-reaction/comment-page-1/#comment-72 Sean Chua Sun, 30 Sep 2007 11:07:00 +0000 http://simplechemconcepts.com/2007/09/29/chemistry-questions-redox-reaction/#comment-72 Well Done Zhengning! You are Right!<br/><br/>This is exatly the approach in answering such question testing on the Oxidation States/Numbers.<br/><br/>Do share this with your friends, siblings and peers alike.<br/><br/>PS: Good for you to type out the detailed working and share with all.<br/><br/>Sean<br/>SimpleChemConcepts 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

]]> By: zhengning http://www.simplechemconcepts.com/chemistry-questions-redox-reaction/comment-page-1/#comment-70 zhengning Sun, 30 Sep 2007 02:10:00 +0000 http://simplechemconcepts.com/2007/09/29/chemistry-questions-redox-reaction/#comment-70 I'll give this question a try. <br/><br/>A)H+ => H20<br/><br/>The oxidation state(number) of H is +1. To find the oxidation state of H in H2O, form eqn: 2H + (-2) = 0<br/>Hence, oxidation state of H in H2O is +1. <br/>A is not the answer.<br/><br/>B)NO2 => NO3^-<br/>Find the oxidation state of N in NO2 and NO3^-.<br/><br/>Eqn: N + (-2 X 2) = 0<br/>N in NO2 = +4<br/><br/>Eqn: N + (-2 X 3) = -1<br/>N in NO3^- = +5 <br/><br/>This could be the answer.<br/><br/>C)SO2 => SO3^2-<br/>Find the oxidation state of S in SO2 and SO3^2-.<br/><br/>Eqn: S + (-2 X 2) = +4<br/>S in SO2 = +4<br/><br/>Eqn: S + (-2 X 3) = -2<br/>S in SO3^- = +4 <br/><br/>C is not the answer.<br/><br/>D)SO3 => SO4^2-<br/>Similarly, we will get +6 for S in both SO3 and SO4^2- <br/><br/>So.... (B) is the answer. 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.

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