Explanation:

- Part VIII: This part of the Indian Constitution is about the administration of Union Territories. It's not related to the Union-State relations.

- Part XI: This is indeed the correct part that deals with the relations between the Union and the States. It is divided into two chapters: "Legislative Relations" and "Administrative Relations."

- Part VII: Initially dealt with the "Part-B states" but was repealed by the Constitution (Seventh Amendment) Act, 1956, and hence is not relevant to current Union-State relations.

- Part IX: This part is related to the Panchayats and is focused on local government, not Union-State relations.

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