Redox Reactions

500 mL of 0.2 M MnO4- solution in basic medium when mixed with 500 mL of 1.5 M KI solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard x M thiosulphate solution in presence of starch till the end point. If 300 mL of thiosulphate was consumed, then the value of x is .

500 mL of 1.2 M KI solution is mixed with 500 mL of 0.2 M KMnO4 solution in basic medium. The liberated iodine was titrated with standard 0.1 M Na2S2O3 solution in the presence of starch indicator till the blue color disappeared. The volume (in L) of Na2S2O3 consumed is . (Nearest integer)

X and Y are the number of electrons involved, respectively during the oxidation of I- to I2 and S2- to S by acidified K2Cr2O7. The value of X + Y is .

200 cc of x 10-3 M potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's salt solution in acidic medium. Here x = .

Only 2 mL of KMnO4 solution of unknown molarity is required to reach the end point of a titration of 20 mL of oxalic acid (2M) in acidic medium. The molarity of KMnO4 solution should be M.

The lowest oxidation number of an atom in a compound A2B is -2 . The number of electrons in its valence shell is .

Number of moles of H+ ions required by 1 mole of MnO4- to oxidise oxalate ion to CO2 is .

2MnO4- + bI- + cH2O xI2 + yMnO2 + zOH- If the above equation is balanced with integer coefficients, the value of z is .

Total number of species from the following which can undergo disproportionation reaction is . H2O2, ClO3-, P4, Cl2, Ag, Cu+1, F2, NO2, K+

From the given list, the number of compounds with +4 oxidation state of Sulphur . SO3, H2SO3, SOCl2, SF4, BaSO4, H2S2O7