Answer: 3 F2 + 1 P2 ⇒ 2 PF3
Explanation:
Fluorine reduces from 0 ⇒ -I and Phosphor oxidises from 0 ⇒ + III
But usually P is in form P or P4 (white or red Phosphor)
So there need to be three F atoms receiving donated electrons from
one P atom. Then proportion F:P =3:1
