A Level Chemistry Redox Question HelpWatch
But Br is oxidised (-2 to -1) and Hydrogen is reduced (+2 to +1)??
Can someone help please, is it redox or not??
BaBr2 (+2,-2) + H2S (+2,-2) ---> BaS (+2,-2) + 2HBr (+2,-2)
Cr2O72- + 14H+ + 6Li --> 2Cr3+ + 7H2O + 6Li+
Chromium is reduced because the oxidation number decreases from +6 to +3.
If you take into account the number of moles, chromium would not be reduced.