1
AIEEE 2005
+4
-1
The lanthanide contraction is responsible for the fact that
A
B
Zr and Nb have similar oxidation state
C
D
Zr and Zn have the same oxidation
2
AIEEE 2005
+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
3
AIEEE 2005
+4
-1
The oxidation state of chromium in the final product formed the reaction between $$K{\rm I}$$ and acidified potassium dichromate solution is :
A
$$+3$$
B
$$+2$$
C
$$+6$$
D
$$+4$$
4
AIEEE 2005
+4
-1
Heating mixture of $$C{u_2}O$$ and $$C{u_2}S$$ will give
A
$$C{u_2}S{O_3}$$
B
$$CuO + CuS$$
C
$$Cu + S{O_3}$$
D
$$Cu + S{O_2}$$
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