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1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey power. The transformation is related to :
A
a change in the partial pressure of oxygen in the air
B
a change in the crystalline structure of tin
C
an interaction with nitrogen of the air at very low temperature
D
an interaction with water vapor contained in the humid air
2
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Which one of the following substances has the highest proton affinity?
A
H2S
B
NH3
C
PH3
D
H2O
3
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite :
A
is an allotropic form of diamond
B
has molecules of variable molecular masses like polymers
C
has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
D
is a non-crystalline substance
4
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
What may be expected to happen when phosphine gas is mixed with chlorine gas?
A
PCI3 and HCI are formed and the mixture warms up
B
PCI5 and HCI are formed and the mixture cools down
C
PH3.Cl2 is formed with warming up
D
The mixture only cools down
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