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Biology, 22.06.2019 21:00
Brass gets discoloured in air because of the presence of which of the following gases in air? a. oxygen b. hydrogen sulphide c. carbon dioxide d. nitrogen
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Biology, 22.06.2019 22:30
Based on their relative positions in the periodic table, which two elements would have the same number of valence electrons?
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These are groups of reproducing populations that are insulated from other groups
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Which substance is a compound? A. Water B. Gold C. Oxygen D. Hydrogen...
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