I bought an Ipad 10th generation.

The new iPad10 has different physical dimensions to any other iPad. As such, for fitted cases, those designed for other models of iPad will not be suitable.

Likely not. You'll need a case for the correct product.

No the iPad 5 is 9.7 inches and the new one is 10.9 inches so you will need a new case

No.

You'll need to purchase a case for a 10.9 inch screen iPad 10th generation.

Best of Luck to You!