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
Same substance (e.g. heavy water) is used as moderator & coolant
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
Can't attain high temperature at normal pressure
None of these
Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

It is difficult to control fusion reaction
The fuel required (e.g. deuterium and tritium) is scarce
Quantity of fuel required for initiating fusion reaction is prohibitively high
It is difficult to initiate fusion reaction

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