Physics
Metals are good conductors of electricity because:

They contain free electrons.
They have high melting point.
The atoms are lightly packed.
All of these

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Physics
Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water
It produces corrosion
Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water

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