Answer:
Correct answers are B and F.
Explanation:
Inside the test tube after a certain time, the pressure inside of the test tube must be equal to the atmospheric pressure, the hydrogen displaces the water inside the tube until the pressure is the same with the atmosphere.
The hydrogen pressure inside the tube must be lower than the atmospheric pressure because otherwise the water inside it would go out until it reaches the atmosphere pressure. The atmospheric pressure is equal to the addition of the hydrogen and water pressures.
Answer:
answer is 2 I think I'm correct sorry if I'm not
Answer:
b All of them are highly reactive nonmetals