In a particular reaction, styrene is produced by removing hydrogen from ethylbenzene. Which type of reaction is this? Question 2 options:
A)  Reduction
B)  Dehydrogenation
C)  Dehydration
D)  Hydration​

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?