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You have either read it wrong or written it wrong, either way dichromate is Cr2O7 2- (seven oxygens with a negative two charge not two oxygens with a negative seven charge) this means that the Chromate has a oxidation state of 6+ hence the answer has to be C

the notice says that the ratios will be provided but its for the 2012 exam and doesn't clarify if they will be provided for this year. Im assuming they do but will try learn them just in case...

the following are my ranks, my school is ranked 120ish mathematics- 30/45 (need to improve) advanced english- 15/43 physics- 9/25 chemistry- 6/15 business studies- 3/52 studies of religion 1 unit 5/97 with these ranks whats a likely atar?

thanks guys

any good study guides for engineering because me teacher is crap

my teacher isnt the greatest and i want some extra material and books, what study guide does everyone recommend. im considering buying the success one hsc past papers is it worth it or should i get something else

i recently received my preliminary final exam results for chemistry back and they were not great as i failed. im assuming i failed chemistry altogether as i havnt done that great. im doing 13 units and want to drop one to have 11 for my HSC. i dont want to drop chemistry because i know i can do...