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

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
All of these

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

None of these
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
Is not at all corrosive, even at a higher temperature

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