Which of the following electrodes will act as anodes, when connected to Standard Hydrogen Electrode?

(i) Al/Al₃⁺                             Eᶱ V = –1.66

(ii) Fe/Fe₂⁺                           Eᶱ V= – 0.44

(iii) Cu/Cu₂⁺                        Eᶱ V= + 0.34

(iv) F₂ (g)/2F^– (aq)               Eᶱ V= + 2.87

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.