Question

Element present at the top of the reactivity series are stored under oil . Give reason?

Answer 1

the reactivity will be decreased

Answer 2

Elements high in the reactivity series are stored under oil/ paraffin because they are highly reactive and readily reacts with moisture in the air to form corresponding metal hydroxides. For instance, Sodium metal when left in open air reacts with water to form sodium hydroxide as shown below.

2 Na + H₂O→ 2 NaOH + H₂