Question

flexible tubing that connects the bunsen burner to the gas tap is called:
○ collar
○ rubber hose
○ barrel/chimney

Explanation:

In a laboratory setup, the flexible tubing used to connect a Bunsen burner to the gas tap is typically a rubber hose. A collar is a part of the Bunsen - burner structure for other purposes like adjusting the air - flow, and the barrel or chimney is the main vertical part of the Bunsen burner through which the gas burns.

Answer:

B. Rubber hose