Question

a sparkle current is passed through oxygen to prepare ozone

Answer 1

maybe doing that joins another oxygen molecule that forms ozone.

Answer 2

Hey dear,

● Formation of ozone in nature -
Naturally, ozone is formed when UV light strikes on oxygen molecule to form nascent oxygen which again reacts with oxygen molecule to form ozone.
O2 + UV --> 2[O]
O2 + [O] --> O3

● Production of ozone in lab -
Experimentally, sparkless current is passed via oxygen gas to form nascent oxygen which again reacts with oxygen molecule to form ozone.
O2 + current --> 2[O]
O2 + [O] --> O3

Hope this helped you...