united states
Antarctica is a continent. You may be thinking of the ocean that surrounds the continent, which is the Southern Ocean. Indeed, it is separate from the oceans that feed it: the Pacific, the Atlantic and the Indian.
Asia continent
A "continent" is the land area; the Pacific Ocean isn't a land area. The Pacific Ocean separates the North and South America continents from Asia.
A continent between the Indian and Pacific oceans is Asia. The Indian Ocean is to the south of the continent while the Pacific Ocean is around the eastern side of it.
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There is a continent in the Pacific ocean, "Australia".
The continent that borders the Atlantic, Pacific, an Indian Oceans is Antarctic. The southern part of the Atlantic Ocean and the southern part of the Pacific Ocean are what borders Antarctica.
It depends on what continent it is. If the continent is North America, the North Atlantic Ocean is northeast, the North Pacific Ocean is northwest, and the Arctic Ocean is north.
Indiana is a state in the United States of America. The Pacific Ocean is on the western border of the United States, which is on the continent of North America, so Indiana is on the North American continent that borders the Pacific Ocean.
Australia
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No it is in the Pacific Ocean.