1.
If the molecular weight of Na2S2O3Na_2S_2O_3 and I2I_2 are M1M_1 and M2M_2 respectively, then what will be the equivalent weight of Na2S2O3Na_2S_2O_3 and I2I_2 in the following reaction?
2S2O32+I2S4O62+2I2S_2O_3^{2-} + I_2 \rightarrow S_4O_6^{2-} + 2I^-