Which element is reduced in this reaction? Cr2O72−+3HNO2+5H+→2Cr3++3NO3−+4H2O?
Oxidation is an increase in the oxidation state, while reduction is the decrease in oxidation state. The oxidizing agent is the reactant which does the oxidizing and therefore, contains the element reduced. And the reducing agent is the reactant which does the reducing and therefore, contains the element oxidized.
+6 -2 ……….+1+3-2 ………. +1 ………+3 ………+5-2 ……..+1-2
Cr2O7^2- + 3HNO2(aq) + 5H+ –> 2Cr3+ + 3NO3^- + 4H2O(l)
Cr is reduced, and therefore, Cr2O7^2- is the oxidizing agent.
N is oxidized, and therefore, HNO2 is the reducing agent.
Which element is reduced in this reaction? cr2o72−+3hno2+5h+→2cr3++3no3−+4h2o