A:AnswerNo, the Apple Pencil (1st Generation) is not compatible with the iPad Air 11" (M2). This iPad only supports the newer Apple Pencil (USB-C) and Apple Pencil Pro.
A:AnswerYes — open box Apple products usually still include Apple’s 1-year manufacturer warranty, as long as the device is eligible and properly activated with a valid purchase date.
A:AnswerPressure sensitivity is controlled mainly by the Apple Pencil hardware, not a setting you turn on/off in the iPad
It only works in apps that support it (Procreate, Adobe Fresco, etc.)