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

Solution

## The correct option is C Strictly speaking, the rule does not apply to complex mixtures and egg yolk is a complex mixture$$\rightarrow$$ Upon heating, the molecules gain kinetic energy and hence there is random motion which leads to expansion$$\rightarrow$$  $$\therefore$$ 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.Physics

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