Nuclear Power Engineering
A homogeneous reactor is the one, in which the

All of these
The fuel and the moderator is mixed to form a homogeneous material
Fissile atoms are evenly distributed throughout the mass of nuclear reactor
Same substance (e.g. heavy water) is used as moderator & coolant

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Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
Is not at all corrosive, even at a higher temperature
Can't attain high temperature at normal pressure
None of these

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