[sn1sn2e1e2]

A large positive value of ΔG° corresponds to which of these?

(A) small positive K
(B) small negative K
(C) large positive K
(D) large negative K

The question gives no further details about enthalpy so you do not know if it's endo or exo.

I chose D thinking that the negative signs cancel out in G=H-TS but the correct one is A!

How do you solve this ambiguous problem?

{MOD Edit} replace KoOl TiTlE with a useful title

[Borek]

Nothing ambiguous here, there is a well known, simple relationship between ΔG° and K.

Is negative K possible at all?

[sn1sn2e1e2]

Isn't the K asking as in terms of Kelvin..?

[Borek]

No, K is not a temperature in Kelvins.

Besides, is it possible to have a negative temperature expressed in Kelvins?

[sn1sn2e1e2]

Oh wow, I was not thinking, absolute zero is the "threshold" smallest (if impossible) temperature.

Thanks Borek!