Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?
A
O<sub>2</sub>, N<sub>2</sub>, steam, CO<sub>2</sub>
B
O<sub>2</sub>, N<sub>2</sub>, water vapour
C
SO<sub>2</sub>, NH<sub>3</sub>, CO<sub>2</sub>, moisture
D
O<sub>2</sub>, N<sub>2</sub>, H<sub>2</sub>, air
Correct Answer: O<sub>2</sub>, N<sub>2</sub>, H<sub>2</sub>, air