The salt concentration (measured as salinity in parts per thousand), is _______ % in sea.
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Among chemical properties, Mendeleev concentrated on the compounds formed by the elements with
Covalent Bond is also called _________.
Which of the following is a commercial source of energy?
Which of the following elements has the lowest melting point?
In the reaction H2O2 + Cl2 -----> 2HCl + O2, H2O2 acts as
What is the weight of one mole Carbon atoms?
............ element is represented by the given symbol.
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