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1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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
2
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that :
A
oxygen in air reacts with the emitted HCI gas to form a cloud of chlorine gas
B
strong affinity of HCI gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke
C
due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards it self. This moisture forms droplets of water and hence the cloud.
D
concentrated hydrochloric acid emits strongly smelling HCI gas all the time.
3
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
4
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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