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

Can't attain high temperature at normal pressure
None of these
Is not at all corrosive, even at a higher temperature
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
The main purpose of control rod in a nuclear reactor is to control the

Conversion of fissile material into fertile material
Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Emission of hazardous radiation
Velocity of the secondary neutrons

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