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A freshly cut piece of sodium when expos...

A freshly cut piece of sodium when exposed to air for some time looses its lustre in the freshly cut portion.
a) What may be the reason for this?.
b) Write any two chemical equations to substantiate your answer.

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a) sodium reacts with air, water and vapour in the atmosphere.
b) `2Na (s) + O_2 (s) rarr 2Na_2 O (s) `
`2Na (s) + 2H_2 O (l) rarr 2naOH (s) + H_2 (g)`
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