Which statement is true for a system in chemical equilibrium? Mark all that apply. 1 The forward reaction is happening more quickly than the reverse reaction.
2 The reaction is not reversible.
3 The reverse reaction is happening more quickly than the forward reaction.
4 The reaction is reversible.
5 The forward reaction is happening at the same rate as the reverse reaction.
6 All reactants are turned into products and the reaction stops.

answer: - first one is the correct answer. .

explanations: - potassium sulfide is and cobalt(ii) chloride is .

charge on k is +1, charge on s is -2, charge on co is +2 and charge on cl is -1.

in a double replacement reaction the ion exchange takes place. in general the reaction looks like:

if one of the product is insoluble as per solubility rules then a precipitate of it is formed.

when we mix the aqueous solutions of potassium sulfide and cobalt(ii) chloride then chloride ion goes with potassium ion and sulfide ion goes with cobalt ion and the balanced equation is written as:

k and cl has equal charges, similarly co and s has equal charges and hence no subscripts are used for the product side.

as per the solubility rules, cos is insoluble and so it's precipitate is formed.

looking at the given choices, first choice is correct.