Which of the following is not true?

if the net force of an object is not zero, then there will be acceleration of some kind and the object will change the magnitude and/or direction of motion.

newtons are the unit used for forces.

when a force acts on an object unopposed, the net force is zero.

if the sum of all forces on an object is zero, then the object will not accelerate.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.