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1
AIEEE 2005
MCQ (Single Correct Answer)
+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
$$+4$$
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 2004
MCQ (Single Correct Answer)
+4
-1
Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?
A
Cu2I2 is reduced
B
Evolved I2 is reduced
C
Na2S2O3 is oxidized
D
CuI2 is formed
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