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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 got converted to grey powder. This transformation is related to :

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An Intiative by Sri Chaitanya

A change in the crystalline structure of tin

An interaction with nitrogen of the air at very low temperatures

A change in the partial pressure of oxygen in the air

An interaction with water vapour contained in the humid air.

answer is A.

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Detailed Solution

As temperature decreases, white tin $(β - f o r m)$ changes to grey tin $(α - f o r m)$

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