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1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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
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
Glass is a :
A
super-cooled liquid
B
gel
C
polymeric mixture
D
micro-crystalline solid
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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