among these processes, which is the slowest chemical reaction?\no digesting food\no boiling an egg\no…

Brief Explanations:

Digesting food occurs over hours. Boiling an egg is a relatively quick process taking minutes. Tarnishing of silver is a slow - chemical reaction but can take days to weeks to be visibly significant. Melting of a glacier is a physical change, not a chemical reaction. Among the chemical reactions (digesting food and tarnishing of silver), tarnishing of silver is slower as it is an oxidation process that occurs gradually in the presence of sulfur - containing compounds in the air.

Answer:

tarnishing of silver