p-block Elements and their Compounds - II — Flashcards
Telangana Open School (TOSS) · Class 12 · Chemistry
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Classify the following oxides: K₂O, SO₂, Al₂O₃
Answer
K₂O – Basic oxide (metal oxide, reacts with acid) SO₂ – Acidic oxide (non-metal oxide, forms H₂SO₃ with water) Al₂O₃ – Amphoteric oxide (reacts with both acids and bases)…
Write the reaction when SO₂ reacts with NaOH.
Answer
$$\mathrm{SO}_2 + 2\mathrm{NaOH} \longrightarrow \mathrm{Na}_2\mathrm{SO}_3 + \mathrm{H}_2\mathrm{O}$$ This shows the acidic nature of SO₂ as it forms salt and water with a base.
Explain why SiO₂ is acidic even though it does not react with water.
Answer
SiO₂ is acidic because it reacts with strong bases like NaOH to form salt and water: $$\mathrm{SiO}_2 + 2\mathrm{NaOH} \longrightarrow \mathrm{Na}_2\mathrm{SiO}_3 + \mathrm{H}_2\mathrm{O}$$ It doesn't…
What happens when ZnO reacts with H₂SO₄ and NaOH? Show equations.
Answer
Amphoteric behavior of ZnO: With acid: $$\mathrm{ZnO} + \mathrm{H}_2\mathrm{SO}_4 \longrightarrow \mathrm{ZnSO}_4 + \mathrm{H}_2\mathrm{O}$$ With base: $$\mathrm{ZnO} + 2\mathrm{NaOH} \longrightarrow …
Define amphoteric oxide. Give two examples.
Answer
An amphoteric oxide reacts with both acids and bases to form salt and water. Examples: ZnO, Al₂O₃…
Draw the structure of ozone (O₃).
Answer
Ozone has a bent/V-shaped structure due to sp² hybridization and resonance. Bond angle: 117°, Bond length: 128 pm. Resonance hybrid of: $$\mathrm{O}=\mathrm{O}^+-\mathrm{O}^- \leftrightarrow \mathrm{O…
Why is ozone a powerful oxidizing agent?
Answer
Ozone is unstable and decomposes to give nascent oxygen: $$\mathrm{O}_3 \longrightarrow \mathrm{O}_2 + \mathrm{O}$$ This nascent oxygen is highly reactive and oxidizes many substances.
Write the reaction of ozone with PbS.
Answer
$$4\mathrm{O}_3 + \mathrm{PbS} \longrightarrow \mathrm{PbSO}_4 + 4\mathrm{O}_2$$ Black lead sulfide is oxidized to white lead sulfate.
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