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AIEEE 2004 Chemistry Solved Paper
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Question : 75
Total: 75
The soldiers of Napoleon 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 change in the partial pressure of oxygen in the air
a change in the crystalline structure of tin
an interaction with nitrogen of the air at very low temperature
an interaction with water vapor contained in the humid air
Validate
Solution:
Grey tin
⇌
white tin
Grey tin is brittle and crumbles down to powder in very cold climate
The conversion of grey tin to white tin is accompanied by increase in volume. This is known as tin plaque or tin disease.
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