1
AIEEE 2011
+4
-1
In context of the lanthanoids, which of the following statements is not correct ?
A
All the members exhibit +3 oxidation state
B
Because of similar properties the separation of lanthanoids is not easy.
C
Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.
D
There is a gradual decrease in the radii of the members with increasing atomic number in the series.
2
AIEEE 2011
+4
-1
The outer electron configuration of $$Gd$$ (Atomic No. $$64$$) is :
A
$$4{f^3}\,5{d^5}\,6{s^2}$$
B
$$4{f^8}\,5{d^0}\,6{s^2}$$
C
$$4{f^4}\,5{d^4}\,6{s^2}$$
D
$$4{f^7}\,5{d^1}\,6{s^2}$$
3
AIEEE 2009
+4
-1
In context with the transition elements, which of the following statements is incorrect ?
A
In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.
B
In the highest oxidation states, the transition metal show basic character and form cationic complexes.
C
In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding
D
Once the d5 configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.
4
AIEEE 2009
+4
-1
Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect ?
A
Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.
B
The ionic sizes of Ln (III) decrease in general with increasing atomic number.
C
Ln (III) compounds are generally colourless
D
Ln (III) hydroxides are mainly basic in character.
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