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11.26     Classify the given oxide as neutral, acidic, basic or amphoteric. Write suitable chemical equations to show their nature.

                   CO,B_{2}O_{3},SiO_{2},CO_{2},Al_{2}O_{3},PbO_{2},Tl_2O_{3}

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CO is a neutral

Acidic oxides-
Being acidic, the oxides react with bases to form a salt. So take base = sodium hydroxide (NaOH

B_{2}O_{3},\ SiO_{2},\ CO_{2}
these compounds react with a base to form salts. ex.- sodium metaborate, sodium silicate and sodium carbonate respectively.
\\B_{2}O_{3}+2NaOH\rightarrow 2NaBO_{2}+H_{2}O\\ SiO_{2}+2NaOH\rightarrow 2Na_{2}SiO_{3}+H_{2}O\\ CO_{2}+2NaOH\rightarrow 2Na_{2}CO_{3}+H_{2}O

Basic Oxides- 
It reacts with an acid to form salts. let acid = hydrochloric acid (HCl). for example thallium chloride.

Tl_{2}O_{3}+6HCl\rightarrow 2TlCl_{3}+3H_{2}O

Amphoteric Oxides-
These oxides have a tendency to react with acid as well as with the base.

PbO_{2},\ Al_2O_{3}
The reaction of lead oxide with acid and base-

\\PbO_{2}+2NaOH\rightarrow Na_{2}PbO_{3}+H_{2}O\\ PbO_{2}+2H_{2}SO_{4}\rightarrow 2PbSO_{4}+2H_{2}O+O_{2}

The reaction of aluminium oxide with base and acid-
\\Al_2O_{3}+2NaOH\rightarrow NaAlO_{2}\\ Al_2O_{3}+3H_{2}SO_{4}\rightarrow Al_{2}(SO_{4})_3+3H_{2}O

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manish

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