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

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

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

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

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