What is an effective way to slow down or stop this reaction in aqueous solution?
naoh(aq)+kci(aq) -> naci (aq) +koh (aq)
increase the pressure of the reaction mixture
increase the surface area of the reactants
add a catalyst to the reaction mixture
add a lot of water to the reaction mixture

Add a lot of water to the reaction mixture.

Explanation:

The rate of the reaction is directly proportional to the concentration of the reactants.

So, adding a lot of water to the reaction mixture will decrease the concentration of the reactants. Thus, it slows down or stop the reaction.

So, the right choice is:

add a catalyst to the reaction mixture

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

i'm assuming that the correct answer is indeed the first one/ "a"..