In the reaction, Na2S2O3 + I2 → Na2S4O6 + NaI , ( not balanced ), which of the following is/are TRUE? P) Na2S2O3 is a reducing agentQ) Iodine is an oxidising agentR) It is an example of inter molecular redox reactionS) In Na2S4O6 the average oxidation state of S is (+5/2)