CBSE Class 12 Chemistry Notes: d and f Block Elements – Objective Problems

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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