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Home » (a) Classify the following oxides as neutral, acidic, basic or amphoteric. (B) Write suitable equations to show their nature.
(a) Classify the following oxides as neutral, acidic, basic or amphoteric. \mathrm{CO}, \mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{SiO}_{2}, \mathrm{CO}_{2}, \mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{PbO}_{2}, \mathrm{Tl}_{2} \mathrm{O}_{3} (B) Write suitable equations to show their nature.
CBSE | Chemistry | Class 11 | Exercise 1 | NCERT | The p-Block Elements
(a) Classify the following oxides as neutral, acidic, basic or amphoteric. \mathrm{CO}, \mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{SiO}_{2}, \mathrm{CO}_{2}, \mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{PbO}_{2}, \mathrm{Tl}_{2} \mathrm{O}_{3} (B) Write suitable equations to show their nature.

Solution:

\rightarrow CO = Neutral
\rightarrow \mathrm{B}_{2} \mathrm{O}_{3}= Acidic
Being acidic, it responds with bases to frame salts. It responds with \mathrm{NaOH} to frame sodium metaborate.
\mathrm{B}_{2} \mathrm{O}_{3}+2 \mathrm{NaOH} \rightarrow 2 \mathrm{NaBO}_{2}+\mathrm{H}_{2} \mathrm{O}
\rightarrow \mathrm{SiO}_{2}= Acidic
Being acidic, it responds with bases to frame salts. It responds with NaOH to frame sodium silicate
\mathrm{B}_{2} \mathrm{O}_{3}+2 \mathrm{NaOH} \rightarrow 2 \mathrm{NaBO}_{2}+\mathrm{H}_{2} \mathrm{O}
\rightarrow \mathrm{SiO}_{2}= Acidic
Being acidic, it responds with bases to frame salts. It responds with \mathrm{NaOH} to frame sodium silicate.
\mathrm{SiO}_{2}+2 \mathrm{NaOH} \rightarrow 2 \mathrm{Na}_{2} \mathrm{SiO}_{3}+\mathrm{H}_{2} \mathrm{O}
\rightarrow \mathrm{CO}_{2}= Acidic
Being acidic, it responds with bases to frame salts. It responds with \mathrm{NaOH} to frame sodium carbonate.
\mathrm{CO}_{2}+2 \mathrm{NaOH} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}
\rightarrow \mathrm{Al}_{2} \mathrm{O}_{3}= Amphoteric
Amphoteric substances respond with the two acids and bases. \mathrm{Al}_{2} \mathrm{O}_{3} responds with both \mathrm{NaOH} and \mathrm{H}_{2} \mathrm{SO}_{4}
\mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{NaOH} \rightarrow \mathrm{NaAlO}_{2} \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}+3 \mathrm{H}_{2} \mathrm{O}
\rightarrow \mathrm{PbO}_{2}= Amphoteric
Amphoteric substances respond with the two acids and bases. \mathrm{PbO}_{2} responds with both \mathrm{NaOH} and \mathrm{H}_{2} \mathrm{SO}_{4}
\mathrm{PbO}_{2}+2 \mathrm{NaOH} \rightarrow \mathrm{Na}_{2} \mathrm{PbO}_{3}+\mathrm{H}_{2} \mathrm{O} 2 \mathrm{PbO}_{2}+2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow 2 \mathrm{PbSO}_{4}+2 \mathrm{H}_{2} \mathrm{O}+
\mathrm{O}_{2}
\rightarrow \mathrm{Tl}_{2} \mathrm{O}_{3}= Basic
Being essential, it responds with acids to frame salts. It responds with \mathrm{HCl} to frame thallium chloride
\mathrm{Tl}_{2} \mathrm{O}_{3}+6 \mathrm{HCL} \rightarrow 2 \mathrm{TlCl}_{3}+3 \mathrm{H}_{2} \mathrm{O}
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