Prob 1. If the configuration of manganese is then maximum oxidation number of manganese will be

               (A) +7                                                            (B)  +6

               (C) +2                                                            (D)  +4

Sol.         (A)

Prob 2. Transition elements should be more reactive than hydrogen on the basis of electrode potential. But most of them do not give hydrogen on reaction with dilute acids because

(A) an oxide layer is formed on their surface.

(B) metallic bonds are strong in them.

(C) their hydration energy is low.

(D) their electronegativity is low.

Sol.  (A)

Prob 3.  Transition elements get hydrolysed because they have

               (A) vacant orbitals                                           (B)  high atomic weights

               (C) unpaired electrons                                     (D)  fully filled orbitals

Sol. (A)

Prob 4.    The acid anhydride of permanganic acid is

               (A) Mn2O7                                                       (B)  MnO3

               (C) MnO2                                                        (D)  MnO

Sol. (A)

Prob 5. Cu2+ ion is more stable than Ag2+ ion because

               (A) structure of Cu2+ is symmetrical.                 (B)  exchange energy  of Ag2+ is high.

               (C) exchange energy of Cu2+ is high.                 (D)  Ag2+ is hard.

Sol. (C)

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Class 12 Chemistry d and f Block Elements All Topic Notes Class 12 Chemistry All Chapters Notes

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