Answer:
A: dry air
Explanation:
Trust me this is right, I’m doing the exam rn and if its not right I will come back and edit this.
Copper oxidizes in moist air
2Cu + CO₂ + O₂ + H₂O = (CuOH)₂CO₃
copper reacts with concentrated acids, for example, with nitric acid
Cu + 4HNO₃ = Cu(NO₃)₂ + 2NO₂ + 2H₂O
copper reacts with chlorine
Cu + Cl₂ = CuCl₂
copper reacts with oxygen when heated
2Cu + O₂ = 2CuO
The molecules of a liquid are not as compact as that of the solids. Though it has a fixed volume, the shape it takes is dependent on the container. Thus, the answer to this question is letter "B. fixed volume, takes the shape of its container".
In my opinion, it is Ar (Argon)
Because as we move from left to right in a period, the value of ionization energy increases and Argon occupies the left most side in the respective period of the Periodic Table
