Is my iPad Pro 9.7 inch eligible for trade in

The iPad Pro 9.7" was the original (i.e. first generation) iPad Pro. This model is now obsolete - and has no residual monetary or credit value for trade-in with Apple. Apple will, however, responsibly recycle an unwanted device at no cost to you.

You might try selling your iPad privately - but be aware that potential buyers are unlikely to offer much if anything for an obsolete device that has no support from Apple, and few remaining compatible Apps available from the App Store.

You can find out here by entering the Serial Number of the iPad: Apple Trade In - Apple

In addition to the excellent response by Zachyy, you could take your iPad to your local Apple Retail Store for a trade-in on the spot.

Have a nice day! 👋🏼😉