Physics
The redness in atmosphere at Sunrise and Sunset is due to :

Reflection of light
Scattering of light
Refraction of light
Dispersion of light

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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
Density of heavy water is higher than that of ordinary water
Freezing point of heavy water is higher than that of ordinary water

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