Can a law wipe out a treaty

Yes. This is known as a treaty breach.

If a party has materially violated or breached its treaty obligations, the other parties may invoke this breach as grounds for temporarily suspending their obligations to that party under the treaty. A treaty breach does not automatically suspend or terminate treaty relations, however.

d: their own individual powers within the new goverment

you should just come up with the best answers you can nobody is perfect.

explanation: i just want to