Question

When liquids are heated, they turn into gases. The yellow egg yolk present inside the egg is a liquid but when it is heated, it changes into an omelet, which is solid. Why?

• A. Sometimes, liquids turn into solids
• B. Omelet does not follow the above rule
• C. Strictly speaking, the rule does not apply to complex mixtures and egg yolk is a complex mixture
• D. None of the above

Answer 1

The correct option is C Strictly speaking, the rule does not apply to complex mixtures and egg yolk is a complex mixture

$\to$ Upon heating, the molecules gain kinetic energy and hence there is random motion which leads to expansion

$\to$ $\therefore$ liquids convert to gas.

But egg yolk is a complex mixture of various protons (amino acid). Hence energy is required to break the protein and it turns into solid.