The oxidation state of Cr in K\(_2\)Cr\(_2\)O\(_7\) is?

Which of the following metals is purified commercially by electrolysis?

C(s) + H2O(g) → H2(g) + CO2(g)
ΔG for the reaction above at 1300k is -43KJ. At this temperature, the reaction is?

Two equal bulbs, one containing ammonia and the other nitrogen are opened mouth - to - mouth to each other at room temperature. The entropy in the mixture of gases is likely to?