In the given 15 group elements which is a gas at room temperature?
Nitrogen
Arsenic
Phosphorus
Antimony
Nitrogen is a gas at room temperature and standard pressure, while phosphorus, arsenic, and antimony are solids. Hence option 1 is the correct answer.
Option(2) Arsenic is a solid at room temperature and standard pressure. Hence option 2 is incorrect.
Option(3) Phosphorus is a solid at room temperature and standard pressure. Hence option 3 is incorrect.
Option(4) Antimony is a solid at room temperature and standard pressure. Hence option 4 is incorrect.