Oxidation States of Actinides

Q. The dissociation energy of CH4(g) is 360kcal mol-1 and that of of C2H6 (g) is 620 kcal mol-1.The C-C bond energy ?

Q. Which of the following actinoids show oxidation states up to +7?

1. Am
2. Pu
3. U
4. Np

Q. The reason for greater range of oxidation states in actinoids is attributed to

1. Actinoid contraction
2. 5f, 6d and 7s levels having comparable energies
3. 4f and 5d levels being close in energies
4. The radioactive nature of actionoids.

Q. The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence:

1. Al < Ga < In < Tl
2. Tl < In < Ga < Al
3. In < Tl < Ga < Al
4. Ga < In < Al <Tl