1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The structure of diborane (B2H6) contains :
A
four 2c-2e bonds and two 3c-2e bonds
B
two 2c-2e bonds and four 3c-2e bonds
C
two 2c-2e bonds and two 3c-3e bonds
D
four 2c-2e bonds and four 3c-2e bonds
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
The lanthanide contraction is responsible for the fact that :
A
Zr and Y have about the same radius
B
Zr and Nb have similar oxidation state
C
Zr and Hf have about the same radius
D
Zr and Zn have the same oxidation
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Which of the following factors may be regarded as the main cause of lanthanide contraction?
A
Poor shielding of one of 4f electron by another in the subshell
B
Effective shielding of one of 4f electrons by another in the subshell
C
Poorer shielding of 5d electrons by 4f electrons
D
Greater shielding of 5d electrons by 4f electrons
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
The oxidation state of Cr in [Cr(NH3)4Cl2]+ is :
A
+3
B
+2
C
+1
D
0
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