Physics
The density of a gas is maximum at

High temperature, low pressure
High temperature, high pressure
Low temperature, low pressure
Low temperature, high pressure

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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
Egg absorbs salt from the solution and expands
The density of salt solution exceeds the density of eggs
Water has high surface tension

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