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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
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B
Omelet does not follow the above rule
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C
Strictly speaking, the rule does not apply to complex mixtures and egg yolk is a complex mixture
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D
None of the above
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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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