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Efflorescence,Hygroscopy and Deliquescence

The soldiers ...

Question

The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniform. White metallic tin buttons got converted to grey powder. This transformation is related to:

A

an interaction with water vapour contained in humid air

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B

a change in crystalline structure of tin

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C

a change in the partial pressure of

O_{2}

in air

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D

an interaction with N₂ of air at low temperature

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Solution

The correct option is B a change in crystalline structure of tin
White tin crumbles into a powder due to the formation of grey tin at low temperatures.

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Similar questions

Q. Soldiers of Napolean army which at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got covered by grey powder. This transformation is related to:

Q. 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 powder.
This transformation is related to:

Q. A cell with two electrodes, one of grey tin and the other white tin, both dipped in solution of

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showed zero e.m.f. at 18

^{o}

C. What conclusion may be drawn from this?

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The saturation vapour pressure of water at this temperature is

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. The partial pressure of water vapour in the air on that day is

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