In phosphoric acid, phosphorus has an oxidation state of +5.

The primary products of a strong acid and strong base reaction are salt and water, but salt is the main focus.

The reaction produces zinc chloride and hydrogen gas as a byproduct.

Ionization energy generally increases across a period due to increasing nuclear charge.

Metallic character decreases as you move from left to right across a period.

Ag(NH3)2Cl is a coordination compound with a central silver ion coordinated to two ammonia ligands.

Ionization energy decreases down a group; rubidium has the smallest ionization energy among these.

Sodium is highly reactive and easily oxidized compared to the other metals listed.

Copper is more likely to be reduced because it has a higher reduction potential compared to the other metals listed.