Answer:
-2
Explanation:
Since its a compound, it's charge is 0.
So, there are 2 Fe and 3 Oxygen,
let x = oxidation number of oxygen
2(+3) + 3x =0
x =-2
Side note : even if the oxidation number is positive, make sure to put the positive sign like how you would in numbers
North-East
If the wins makes it to east, then the motor goes north Then it would go North-East
H, I think. The oil has a lower density than the water, so after the 3 minutes it would float on top of the water.