At absolute zero, 0 K, all motion stops. Theoretically the gas does not exert pressure on the walls of the container. Go to your calculator’s data table, "Edit", go to the L1 and L2 lists, enter zero, zero to plot absolute zero (0 K, 0 atm). Adjust the window and plot the data points: Pressure in the vertical axis and Temperature in the horizontal axis. What do you see a when you press and ?

I don’t understand???

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na