1
JEE Main 2013 (Offline)
+4
-1
Which of the following arrangements does not represent the correct order of the property stated against it ?
A
Ni2+ < Co2+ < Fe2+ < Mn2+ : ionic size
B
Co3+ < Fe3+ < Cr3+ < Sc3+ : stability in aqueous solution
C
Sc < Ti < Cr < Mn : number of oxidation states
D
V2+ < Cr2+ < Mn2+ < Fe2+ : paramagnetic behaviour
2
JEE Main 2013 (Offline)
+4
-1
Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $$E_{{M^{3 + }}/{M^{2 + }}}^0$$ value?
A
Mn (Z = 25)
B
Fe (Z = 26)
C
Co (Z = 27)
D
Cr (Z = 24)
3
AIEEE 2012
+4
-1
Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect ?
A
Ferrous oxide is more basic in nature than the ferric oxide
B
Ferrous compounds are relatively more ionic than the corresponding ferric compounds
C
Ferrous compounds are less volatile than the corresponding ferric compounds
D
Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds.
4
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.
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