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

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

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Physics
The sky appears blue because

It is actually blue
In white light, the blue component dominates
The atmosphere scatters blue colour more than the others
All colours interfere to produce blue

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