Is there a metal gaseous at room temperature?

Q. A $12.5eV$ electron beam is used to bombard gaseous hydrogen at room temperature. It will emit:

Q. Gaseous ethane can be used as a fuel for campers. A company manufactures compressed gaseous ethane in 400 ${cm}^3$ meta canisters. A typical metal canister at room temperature contains compressed gaseous ethane at a pressure of 4.00 atm.
(i)Suggest a reason why gaseous ethane in the metal canister does not behave like an ideal gas.
(ii)One metal canister is used for heating water and the pressure decreases from 4.00 atm to 1.50 atm. Assuming that the compressed ethane behaves ideally, calculate the mass of water at room temperature that could be brought to boiling if the process is 80% efficient. The enthalpy change of combustion of ethane is-1420 KJ ${mol}^{-1}$.

Q.

Which of the following after burning at room temperature gives gaseous oxide

Q. Which of the following substance exists in gaseous form at room temperature?