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Atoms and Molecules
Q.4: Write the chemical formulae of the following:
(a) Magnesium chloride
(b) Calcium oxide
(c) Copper nitrate
(d) Aluminium chloride
(e) Calcium carbonate.
(a) Magnesium chloride contains magnesium cation and chloride anion. Magnesium is divalent while chlorine is a univalent ion. The formation of magnesium chloride is shown below:
(b) Calcium oxide contains calcium cation and oxide anion. Both calcium and oxide are divalent ions. The formation of calcium oxide is shown below:
(c) Copper nitrate contains copper cation and nitrate anion. Copper is divalent while nitrate is a univalent ion. The formation of copper nitrate is shown below:
(d) Aluminium chloride contains aluminium cation and chloride anion. Aluminium is trivalent while chlorine is a univalent ion. The formation of aluminium chloride is shown below:
(e) Calcium carbonate contains calcium cation and carbonate anion. Both calcium and carbonate are divalent ions. The formation of calcium carbonate is shown below:
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