Which charger is provided for apple XR from apple ?

You can any use any charger from a previous iPhone, iPad, iPod touch(with a Lightning to USB-C cable) or Mac that has USB-C ports (with the iPhone's included cable). You can use USB chargers from Microsoft, Samsung and most Android devices with the correct Lightning to USB-A cable or Lightning to USB-C cable.

As mentioned the XR currently sold by Apple does not include a charger in the box, only a Lightning to USB-C cable.

It comes with a USB-C to Lightning cable, no power adapter is included.