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

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

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Physics
Skating on ice is possible because

The surface of ice is smooth
Ice is cold
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The pressure on the ice due to skate raises its melting point

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