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Which is the main constituent in air ?
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which gas is used in preaparation of bit salt
Mention the formula to calculate ph of a solution?
What is Distillation ?
Why ph scale range is 14? Why it is not less or not greater than 14?
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 in atomic mass electron is not include while proton and neutron include? although electron is a part of atom.
What is mineral water?
Why do eye-glasses become fogged, when the wearer comes form the cold outdoors into a warm room ?
which of the following is the best conductor of electricity?
What is the principle involved in conductometric titration?
Explain the structure of a dna molecule?
Explain the classification of oxides ?
Organic Chemistry 
