question-

Clarify the legal opinion at the following cases, supported by the relevant legal texts:

1. State (A) has decided to commence negotiations with another state for a particular treaty, state (A) appointed a representative to conduct the negotiations. At the conference, the representative of the state didn't provide the "full powers" instrument.
2. The consent of a State to be bound by a treaty is expressed by the signature of its representative when the treaty provides that signature shall have that effect.