Question

cut a small piece of sodium with a knife. observe the metallic lustre at the newly formed surface. keep it exposed to air for some time. what happened to the surface? what could be the reason?​

Answer 1

Answer:

when sodium metal is exposed to air it readily reacts with oxygen present in the air and form Sodium oxide which is a basic oxide. Due to the formation of oxide, the surface color of sodium changes.

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Answer 2

Answer:

Observe the metallic lustre at the newly formed surface. Keep it exposed to air for some time. ... The surface of the metal gets tarnished. This is due to the reaction with air.