1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
t1/4 can be taken as the time taken for the concentration of a reactant to drop to $$3 \over 4$$ of its initial value. If the rate constant for a first order reaction is K, the t1/4 can be written as
A
0.10 / K
B
0.29 / K
C
0.69 / K
D
0.75 / K
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 IUPAC name of the coordination compound K3[Fe(CN)6] is
A
Potassium hexacyanoferrate (II)
B
Potassium hexacyanoferrate (III)
C
Potassium hexacyanoiron (II)
D
Tripotassium hexcyanoiron (II)
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