Nuclear Power Engineering
Plutonium

Has much lower melting point (640°C ) compared to thorium (1690°C)
Both A & B
Neither A nor B
Is recovered from spent fuel from thermal 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
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

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