Prob 1. If the configuration of manganese is
(A) +7 (B) +6
(C) +2 (D) +4
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.
Prob 3. Transition elements get hydrolysed because they have
(A) vacant orbitals (B) high atomic weights
(C) unpaired electrons (D) fully filled orbitals
Prob 4. The acid anhydride of permanganic acid is
(A) Mn2O7 (B) MnO3
(C) MnO2 (D) MnO
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.
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