Yes, Redmi 6A is a dual-4G phone. You can use 2 Jio 4G sim card in Redmi 6A.
No. Redmi 6A does not come with the earphone in the box. You have to buy it separately.
Yes, Redmi 6A does have the night mode. It also has eye protection mode.
No. Redmi 6A does not have IR remote sensor. You cannot control your TV or AC with it.
The Redmi 6A is a fairly good update to the Redmi 5A, which itself was barely any different compared to the Redmi 4A. You now get a tall screen, better processor, and improved polish overall.