What is the purpose of adding urea?
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How is measurement of ph made?
when we covert any substance into vapour state from solid state, is it ionized or not?
what is the valence of nitrogen?
Why metallic tools used by blacksmiths have wooden handles ?
Give the others form of iron ore.
What is the composition of gun-powder ?
Difference between Physical and Chemical change ?
How is petroleum manufactured?
What is an indicator electrode?
What is mineral water?
Why is a newly made quit warmer than an old one ?
What is Valency ?