deleted apps still appear as purchased in App Store app? How to delete?

You don't.

You cannot delete Apps from that list as that would defeat its purpose. It allows you to download purchased apps without having to re-pay for them. Its apple's way of remembering what apps you already payed for and can download again, without charging you for them again. Purchased Apps cannot be removed from the list.

You can however hide them if you wish:

iTunes Store: Hiding and unhiding purchases

http://support.apple.com/kb/HT4919

Note: The ability to hide them from an iOS device was removed in iOS6.

Deleted apps will always still be purchased apps. They will show up in the purchase history forever. You can hide the purchases if you want to do so, but you can never delete the purchases.

If you want to learn how to hide the purchases, youcan find the information here.

http://support.apple.com/kb/ht4919