Question

26. Write fully balanced equations for the reactions of :

i. Sulphur dioxide and water
ii. Sodium with water
iii. Iron with oxygen
iv. Aluminium and potassium hydroxide.

v. Iron (III) oxide and dilute sulphuric acid.

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Answer 1

Answer :

• Sulphur dioxide react with water to form sulfurous acid and water:-

$\bold{(i)}\:\rm{SO_2(g)+H_2O(l)\longrightarrow{}H_2SO_3(g)}$

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• Sodium reacts with water to form sodium hydroxide and water:-

$\bold{(ii)}\:\rm{2Na(s)+2H_2O(l)\longrightarrow{}2NaOH(aq)+H_2(g)}$

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• Iron reacts with oxygen (in the form of steam) to form iron oxide and hydrogen gas:-

$\bold{(iii)}\:\rm{4Fe(s)+3O_2(g)\xrightarrow{\text{heat}}2Fe_2O_3(s)}$

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• Aluminium reacts with potassium hydroxide to from potassium aluminate along with hydrogen.

$\bold{(iv)}\:\rm{2Al(s)+2KOH(aq)+2H_2O(l)\longrightarrow{}2KAlO_2(aq)+3H_2(g)}$

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• Ferric oxide reacts dilute sulphuric acid to form iron sulphate and water.

$\bold{(v)}\:\rm{Fe_2O_3(s)+3H_2SO_4(aq)\longrightarrow{}Fe(SO_4)_3+2H_2O(l)}$