1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in :
A
exhibiting maximum covalency in compound
B
exhibiting amphoteric nature in their oxides
C
forming covalent halides
D
forming polymeric hydrides
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Which one the following statement regarding helium is incorrect?
A
It is used to fill gas balloons instead of hydrogen because it is lighter and non–inflammable
B
It is used in gas – cooled nuclear reactors
C
It is used to produce and sustain powerful superconducting reagents
D
It is used as cryogenic agent for carrying out experiments at low temperatures
3
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
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?
A
The common oxidation states of cerium are +3 and +4
B
Cerium (IV) acts as an oxidizing agent
C
The +4 oxidation state of cerium is not known in solutions
D
The +3 oxidation state of cerium is more stable than the +4 oxidation state
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