Question

What types of changes are typically involved in equilibrium reactions? A. pressure only B. temperature only C. pressure or temperature D. pressure, temperature, or concentration

Answer 1

The correct answer is option D. i.e. pressure, temperature, or concentration.

Equilibrium reactions can involve
 1) changes in the temperature conditions - high or low or exothermic or endothermic.
2) Pressure - By increasing or decreasing the pressure 
3) Concentration - the changes in concentration take place in either products side or reactants side.