Respuesta :
19. Single displacement reactions are always redox reactions (they include reaction between an element and a compound where they will take place of another element in that compound).
Β 20. It should be single displacement, where the displaced ion would form gas.
Β 20. It should be single displacement, where the displaced ion would form gas.
19.) Single-displacement is the correct answer.
20.) I am not sure, but Single-displacement is incorrect. At least you can cancel that one out.