B. I’m sorry if I’m wrong ! Wasn’t sure about this question .
Answer:
uhhhh rephrase that please lol
Answer: The temperature goes up.2.The piston doesn't move in and out.3.Heat flows out.4. Amount of heat evolved is +285 kj/mol
Explanation:
The temperature in the water bath will rise because heat being evolved is absorbed it.Based on principle of constant pressure, the piston doesn't move in and out.Since the reaction is a combination reaction, heat will be evolved.
It should be I, Br, Cl, F