Physics
Sun appears red in colour at sunrise and sunset due to

That all other colours scatter away except red
Red light having longer wave length scatters away
The fact that sun emits only red colour at that time
That sun comes out of the mountains

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Albumin dissolves in salt solution and egg becomes lighter
The density of salt solution exceeds the density of eggs
Egg absorbs salt from the solution and expands
Water has high surface tension

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