When Do Kc and Kp Equal Each Other?

[ada0713]

The two equilibrium constants for the same reaction Kc and Kp will always equal one another when:

1) all of the reactant and products are gases
2) In the reaction equation, the number of moles of gaseous product is smaller than the number of moles of gaseous reactants.
3) In the reaction equation, the number of moles of gaseous product is greater than the number of moles of gaseous reactants.
4) In the reaction equation, to total number of moles of reactants equal that of the products
5) in the reaction equation, the number of moles of gaseous products equals the number of gaseous reactants.

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above is the question..
I thought that the equilibrium constant changes only when temperature is added
to the system. No matter how much products or reactant you add to the system
the equilibrium constant will stay the same (the actual concentration changes,
adjusting to have same equilibrium constant as before)

None of the answer choices looks correct. I' pretty sure that #1 is wrong, but
other stuff I'm all confused. Please help!

 

[ada0713]

Can anyone help me with this?

 

[ada0713]

never mind I think i have the answer

 

[chemisttree]

Did it involve finding when this equality must be true? $$Kp = Kc(RT)^{delta n}$$