If Femi stands on a chair to hang a picture on a wall but loses his balance and pushes the chair away from him as he falls, what will happen to the chair?

Respond very briefly.
The chair will move in the opposite direction from Femi. When Femi pushes the chair away while losing his balance, he exerts a force on the chair. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Therefore, as Femi applies force to the chair to push it away, the chair will exert an equal force in the opposite direction, causing it to move away from Femi. This reflects the conservation of momentum where Femi's motion in one direction will lead to the chair's motion in the opposite direction.