The average salinity of sea water is
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1) Brass gets discoloured in air because of the presence of which of the following gases in air?
2) According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .
3) Which is/are the important raw material(s) required in cement industry?
4) Rayon is chemically
5) In fireworks, the green flame is produced because of