Posted by Alexis on Sunday, March 20, 2011 at 9:06pm.
Remember Leo the Lion goes Grr. The key word is Leo; i.e., loss electrons oxidation. So reduction is the gain of electrons. If you know it's Sn, then does Sn gain electrons in going from Sn+4 to Sn+2 or from Sn+2 to Sn+4.
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