The soldiers of Napolean army while at Alps during freezing winter ...

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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 get converted to grey powder. This transformation is related to:-
(1) An interaction with water vapour contained in humid air
(2) A change in crystalline structure of tin
(3) A change in the partial pressure of \( \mathrm{O}_{2} \) in air
(4) An interaction with \( \mathrm{N}_{2} \) of air at low temperature
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