How do zinc reacts with air?

How does zinc react with dilute Hydrochloric acid?

How does ammonia react with a solution of Cu^(2+) ?

What happens when: Zinc reacts with conentrated HNO_3

What happens when Magnesium reacts with air then hydrolysed.

How do sodium,magnesium,iron and copper react with water?Arrange these metals in order of decreasing reactivity with the help of these reactions.