Redox Reactions

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

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement I is correct but statement II is incorrect
2. Both statement I and statement II are incorrect
3. Statement I is incorrect but statement II is correct
4. Both statement I and statement II are correct

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+

Chlorine undergoes disproportionation in alkaline medium as shown below : aCl2(g) + bOH-(aq) cClO-(aq) + dCl-(aq) + eH2O(l) The values of a, b, c and d in a balanced redox reaction are respectively :

1. 3, 4, 4 and 2
2. 1, 2, 1 and 1
3. 2, 4, 1 and 3
4. 2, 2, 1 and 3

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

Which of the following cannot function as an oxidising agent?

1. SO42-
2. MnO4-
3. N3-
4. BrO3-