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

None of these
Is not at all corrosive, even at a higher temperature
Can't attain high temperature at normal pressure
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
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

All of these
Density ; hence core volume for a given power output would be smaller
Resistance to effects of irradiation
Melting point, hence can be subjected to higher temperature

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