Zeus did not give Cassandra her ability, this was the gift of Apollo (or she always had the ability and when she rejected Apollo he cursed her prophecy not to be believed).
Cassandra was a princess of Troy who foretold its destruction. Apollo had granted her the power to see the future, but she was ungrateful so he gave her the curse that her prophecies would never be believed.
Cassandra was not a goddess. she was the most beautiful duaghter of the king and queen of troy. Apollo fell in love with her and gave her the gift to see the future. when she denied his love, he turned in into a curse so that she could still see the future, but none would believe her. she predicted the Trojan horse ploy, but none believed her.
Apollo
Yes. Apollo loved Cassandra but Cassandra resented him. Apollo gave her the gift of prophecy but when she resented him Apollo cursed Cassandra so that no one would believe a word that she said.
Her short tunic was one of her birthday wishes granted by her father Zeus. So Zeus gave it to her.
There are two versions. One is that Apollo gave her the power because of her beauty. The other version is that Cassandra spent a night in Apollo's temple and snakes licked her ears clean which gave her the power of prophecy.
He gave Zeus the thunderbolt, Hades the helmet of darkness and Poseidon the trident.
Athene gave him the Aegis, the shield of Zeus. The shield was made for Zeus by Hephaestos.
Oak, as Zeus gave his oracles from the sacred oaks of Dodona.
It is called an emetic, given to Zeus by his wife Metis.
Zeus gave Apollo the power of the sun and poetry.
Zeus, the king of the gods in Greek mythology, is associated with powers of sky, thunder, lightning, and weather. He is also known for his ability to shape-shift, his strength in battle, and his role as both a protector of justice and punisher of wrongdoers.