Physics
Which of the following group of elements are diamagnetic?

Hydrogen, argon, copper
Argon, copper, silver
Hydrogen, oxygen, Argon
Oxygen, copper, silver

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Physics
The blue colour of sky is due to

Reflection of sunlight
Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere
Scattering of shorter wavelengths of sunlight in the atmosphere

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