What did you eat at home?

Please clarify,

Here "What" is an Interrogative Adjective or an Interrogative Pronoun.

closed as off-topic by NVZ, MetaEd, tchrist, user66974, Dan Bron Jul 27 '16 at 13:45

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You use What as a Pronoun here

What did you eat at home?

You ask someone about which thing they ate

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