Nuclear Power Engineering
'Heavy water' is termed as 'heavy' because it is

A heavy liquid
Denser than water
An oxide of heavier isotope of oxygen
An oxide of deuterium

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

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

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