Yes, Samsung Galaxy A50 does have fast charging support. It comes with 15W fast charger in the box. It takes about 30 minutes only to charge the mobile from 0% to 30%.
No. Galaxy A50 has 2 dedicated 4G sim card slots and a dedicated MicroSD card slot. So, you can use 2 sim cards and a MicroSD card at the same time.
Yes, Galaxy A50 does have the support for the face-unlock. Besides, it also has an in-display fingerprint sensor.
Yes, Galaxy A50 does support FM radio.
Yes, Samsung Galaxy A50 does have a 3.5 mm headphone jack.