How is a doorbell an example of an electrical transformation

Iknow #2 is d. i just need to know why

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.