Balance the equations `Cr^(3+) + Na_2O_2 to CrO_4^(-) + Na^(+)`

Balance the equations FeS2 + O_2 to Fe_2O_3 + SO_2 ( molecular form )

Balance the following equations K_2Cr_2O_7+ H_2SO_4 to K_2SO_4 to K_2SO_4 + Cr_2(SO_4)_3 + H_2O + O_2

In the reaction : CrO_(4)^(2-) + X to Cr_(2)O_(7)^(2-) X is

Balance the following equations KMnO_4 + H_2SO_4 to K_2SO_4 + MnSO_4 + H_2O + O_2

The balanced chemical equation for the reaction : MnO_(4)^(-)+AsO_(3)^(3-)+H^(+)toMn^(2+)+AsO_(4)^(3-)+H_(2)O involves

What is the oxidation number of Cr in K_2 CrO_4

Balanced the following chemical equations : NaOH+H_(2)SO_(4)toNa_(2)SO_(4)+H_(2)O .

Balance the following chemical equation : Fe+H_(2)O to Fe_(3)O_(4)+H_(2)