Which wavelengths are visible to human eye?
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Why does a freely supended magnetic needle always point North and South ?
What is importance of principles of solubility product ?
What is the chief commercial use of Phosphorus ?
What is density of a liquid?
Do all explosions produce carbon dioxide or carbon monoxide?
in Einstein's mass energy relation e=mc2 for what is c used or why is light required for reactions. Because the reactions are with help of neutrons
Why ate the electric fuses used in an electric current ?
Explain the Hybridigation?
Explain the how to make Alloys?
How is arsenic produced?
Which gas is used in refrigeration plants ?
Explain the Valency?