Why does the sky appear blue?

Why does a body appear black?

State whether the following statements are True (T) or False (F): The colour of the sky appears black form the surface of the moon.

Why does the table salt, Nacl , sometimes appear yellow in colour ?

Why does water spread over and wet a glass ?

Why does urea have a sharp melting point but glass does not?

Why does nitrogen show anomalous behaviour ?

Why does ozone act as a powerful oxidising agent?