Using the standard electrode potential, find out the pair between which redox reaction is not feasible.

EᶱV values : Fe³⁺/Fe²⁺ = + 0.77; I2 /I^– = + 0.54

Cu²⁺/Cu = + 0.34; Ag⁺ /Ag = + 0.80 V

(i) Fe³⁺ and I^–

(ii) Ag⁺ and Cu

(iii) Fe³⁺ and Cu

(iv) Ag and Fe³⁺

How many of these compounds will undergo disproportionation on hydrolysis? CO?, NO?, Cl?, F?, ClO?, Cl?O?, N?O?, SO?, P?O??

40. Best reducing agent is:
(a) He              (b) Be           (c) Li            (d) Al

37. Which element is considered to have oxidation number of +3 in all its compounds?

(a) Be              (b) Li             (c) Al         (d) Sc

36. Oxidation number ofS in S₂O₈^-2 is

(a) -2           (b) -6           (c) +2          (d) +6

32. Assertion: Na⁺ ion has an oxidation number of +1, Mg²⁺ ion, +2, Fe³⁺ ion, +3, Cl^– ion, –1, O^2– ion, –2; and so on.

Reason: For ions composed of only one atom, the oxidation number is equal to the charge on the ion.