D And F 2

Question 1

Copper has a positive Eo Value which accounts for its inability to liberate hydrogen from acids 

Answer 1

The reason for the positive Eo Value for copper is that the sum of enthalpies of sublimation and ionization is not balanced by hydration enthalpy 

Question 2

Eo For Mn ZN and nickel are more negative than expected from the trend

Answer 2

Greater stability of half filled d subshell d5 in Mn2+ and completely filled d10 in Zn2+.
The exception behavior of Ni towards Ni is due to its high -ve enthalpy of hydration.

Question 3

Transition metals form a large no. Of complex compounds due to

Answer 3

• comparatively smaller size of ions
• high ionic charges
• availability of d orbitals for bond formation.

Question 4

Europium and ytterbium are ——-

Answer 4

Strong reducing agents

Question 5

Ce4+ and Tb4+ are —-

Answer 5

Strong oxidizing agents sinec they can change their oxidation state to +3

Question 6

Reason for lanthanoid contraction

Answer 6

Imperfect shielding of f orbitals
Is unable to counter balance the increase in nuclear charge

Question 7

Michmetall

Answer 7

95- lanthanoid
5-iron
S,C,Ca , and Al- other traces

Question 8

Use of michmetall

Answer 8

Used in mg based alloy to produce bullet shell, and lighter flint

Question 9

Why do you actinoids Show a large variety of oxidation state

Answer 9

This is due to very small energy gap between 5s, 6d and 7s Septian hence all their electrons take part in bond formation