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Question

Write equations for each of the above metal which reacts with water.

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Solution

Being highly reactive, sodium is placed at the top of the reactivity series. It reacts violently with cold water forming sodium hydroxide and hydrogen gas; it may explode with hot water.

2Na + 2H2O 2NaOH + H2 Sodium water Sodium Hydrogen gas hydroxide

Calcium does not react violently with water and forms calcium hydroxide and hydrogen gas.

Ca + 2H2O Ca(OH)2 + H2 Calcium water Calcium hydroxide Hydrogen gas

Magnesium reacts very slowly with cold water but red hot magnesium reacts with steam to form magnesium oxide and hydrogen gas.

Mg + H2O MgO + H2 Magnesium Steam Magnesium oxide Hydrogen gas

Iron does not react with cold water but red hot iron reacts with steam to form tri-iron tetroxide and hydrogen. This is a reversible reaction.

3Fe + 4H2O Fe3O4 + 4H2Red hot Iron Steam Triiron tetroxide Hydrogen gas

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