Air was passed through several reagents shown in the flow chart below.
![Air passing through several reagents](https://www.easyelimu.com/images/form_3_past_papers/Term_1_2021/maths/Air_passing_through_several_reagents.JPG)
- Write an equation for the reaction which takes place in the chamber with magnesium powder.
- Name another solution that can be used in place of conc. KOH solution.
- Name one gas, which escapes from the chamber containing magnesium powder. Give a reason for your answer.