a basic redox qn

http://www.glencoe.com/qe/scienceOLC.php

Qn 11 (in the above website): my answer is C and the correct answer is D.

Please explain O.O

Thanks!

sorry the website should be http://www.glencoe.com/qe/scienceOLC.php?qi=6358

http://www.glencoe.com/qe/scienceOLC.php

Qn 11 (in the above website): my answer is C and the correct answer is D.

Please explain O.O

Thanks!

H2O2 is reduced to H2O, with the OS of its O atoms reduced from -1 to -2.

O- species is not even present in the reaction (as either a reactant or a product), and is therefore irrelevant.

thanks!! so the answer key is wrong?

thanks!! so the answer key is wrong?

If the answer key says O-, then obviously it's wrong. The answer should be H2O2.