who invented the first projector?
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how will you jug that the give organic compound is pure or not ??????
Why white clothe are preferred to dark ones in summer ?
which gas is used in preaparation of bit salt
What is the chemical formula of alum?
What is solubility product ?
Which wavelengths are visible to human eye?
Why is radiator used in a motor-ear ?
What is a cell?
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Which metal is used for coating the backs of the mirrors ?
What is edta?
Hom many total number of inner transition elements are?