Which statement is true about sodium hydroxide (naoh)? it is a salt because it increases the concentration of metallic ions. it is a salt because it is formed by the reaction of an acid and a base. it is a base because it increases the concentration of hydrogen ions. it is a base because it increases the concentration of hydroxide ions.

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