Question:
(a) Classify following oxides as neutral, acidic, basic or amphoteric: CO, B2O3, SiO2, CO2, Al2O3, PbO2, Tl2O3 (b) Write suitable chemical equations to show their nature.
Answer:
(a) and (B) answered together
- CO = Neutral
- B2O3 = Acidic
B2O3 react with NaOH to form sodium metaborate
B2O3 + NaOH →2NaBO2 + H2O
- SiO2 = Acidic
SiO2 react with NaOH to form sodiium silicate.
SiO2 + NaOH → 2Na2SiO3 + H2O
- CO2 = Acidic
CO2 react with NaOH to form Soium carbonate
CO2 + NaOH → Na2CO3 + H2O
- Al2O3 = Amphoteric
It with both NaOH and H2SO4
Al2O3 + 2NaOH →NaAlO2
Al2O3 + 3 H2SO4 → Al2(SO4) + 3H2O
- PbO2 = Amphoteric
PbO2 react with both H2SO4 and NaOH
2PbO2 + 2H2SO4 → 2PbSO4 + 2h2O + O2
PbO2 + 2NaOH → Na2PbO3 + H2O
- Ti2O3 = Basic
Ti2O3 react with HCl to form thallium chloride
. Ti2O3 + 6 HCl → 2TiCl3 + 3H2O
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