Who invented the modern periodic table?
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Which of the following has pH value 7?
Which of the following is a commercial source of energy?
______ bond holds the atoms together within a water molecule.
The Chemical formula of Ammonium oxalate is _____.
Magnesium oxide (MgO) + Water (H2O) = ?
The salt concentration (measured as salinity in parts per thousand), is _______ % in sea.
Which of the following elements has the lowest melting point?
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