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 powder. This transformation is related to :
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a
A change in the crystalline structure of tin
b
An interaction with nitrogen of the air at very low temperatures
c
A change in the partial pressure of oxygen in the air
d
An interaction with water vapour contained in the humid air.
answer is A.
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Detailed Solution
As temperature decreases, white tin (β−form) changes to grey tin (α−form)