Name: (a)a metal that evolves a gas which burns with a pop sound when boiled with alkail. solution. (b) two bases which are not alkalis but dissolve in strong alkalis.

a) Zinc

 

b) Copper oxide is a base because it will react with acids and neutralise them, but it is not an alkali because it does not dissolve in water.

Sodium hydroxide is a base because it will react with acids and neutralise them. It's also an alkali because it dissolves in water.