Question

A silver spoon is inserted inside a boiled egg for some time and found that it turned black. Which content of egg must have caused this change of colour ? A. Oxygen and moisture content B. Moisture content C. Sulphur content D. Oxygen content​

Answer 1

Explanation:

oxygen and moisture content

Answer 2

When a silver spoon is inserted inside a boiled egg for some time it turns black because of the sulphur content of the egg.

Sulphur-containing proteins partly make up the egg yolk and albumin.

Formation of the black colour on the silver spoon inside an egg :

• The amount of hydrogen sulphide in a boiled egg varies.
• During the boiling process, the links between the sulphur groups within the protein's molecular structure are hydrolyzed, and sulphur is released into the water, turning the silver spoon black.
• Silver reacts strongly with sulphur, resulting in a black surface tarnish made up of silver sulphide.

Thus, we can conclude that it's because of sulphur present inside the egg that reacts with silver and turns it black.