1.
xNO3+yI+zH+2NO+3I2+4H2Ox\mathrm{NO_3^-} + y\mathrm{I^-} + z\mathrm{H^+} \rightarrow 2\mathrm{NO} + 3\mathrm{I_2} + 4\mathrm{H_2O}; xx, yy, zz respectively in the above equation are: