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The p-Block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe p-Block Elements5 Marks
Question
  1. Classify following oxides as natural, acidic, basic or amphoteric:
$CO, B_2O_3, SiO_2, CO_2, Al_2O_3, PbO_2, Tl_2O_3$
  1. Write suitable chemical equations to show their nature.
✓

Answer

$CO$ = Natural
$B_2O_3$ = Acidic Being acidic, it reacts with bases to form salts. It reacts with $NaOH$ to form sodium metaborate.
$b_2O_3 + 2NaOH \rightarrow 2NaBO_2 + H_2O$
$SiO_2$= Acidic
Being acidic, it reacts with bases to form salts. It reacts with $NaOH$ to form sodium silicate.
$SiO_2 + 2NaOH \rightarrow 2Na_2SiO_2 + H_2O$
$CO_2$ = Acidic
Being acidic, it reacts with bases to form salts. It reacts with $NaOH$ to form sodium carbonate.
$CO_2 + 2NaOH \rightarrow Na_2CO_2 + H_2O$
$Al_2O_3$ = Amphoteric
Amphoteric substances react with both acids and bases. $Al_2O_3$ reacts with both $NaOH$ and $H_2SO_4$.
$Al_2O_3 + 2NaOH \rightarrow NaAlO_2$
$Al_2O_3 + 3H_2SO_4 \rightarrow Al_2(SO_4) + 3H_2O$
$PbO_2$ = Amphoteric
Amphoteric substances react with both acids and bases. $PbO_2$ reacts with both $NaOH$ and $H_2SO_4$
$PbO_2 + 2NaOH \rightarrow Na_2PbO_3 + H_2O$
$2PbO_2 + 2H_2SO_4 \rightarrow 2PbSO_4 + 2H_2O + O_2$
$Tl_2O_3$ = Basic
Being basic, it reacts with acids to form salts. It reacts with $HCl$ to form thallium chloride.
$Tl_2O_3 + 6HCl \rightarrow 2TICl_3 + 3H_2O$

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