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In which reaction is the underlined substance acting as a base? A HNO₃ + H₂SO₄ → H₂NO₃⁻ + HSO₄⁻ B HSiO₃⁻ + HCN → CN⁻ + H₂O + SiO₂ C HNO₂ + HCO₃⁻ → H₂O + CO₂ + NO₂⁻ D C₆H₅O⁻ + CH₃C(=O)H → C₆H₅OH + CH₃C(=O)O⁻ - CIE - A-Level Chemistry - Question 8 - 2015 - Paper 1
Question 8
In which reaction is the underlined substance acting as a base? A HNO₃ + H₂SO₄ → H₂NO₃⁻ + HSO₄⁻ B HSiO₃⁻ + HCN → CN⁻ + H₂O + SiO₂ C HNO₂ + HCO₃⁻ → H₂O + CO₂ + NO... show full transcript
Worked Solution & Example Answer:In which reaction is the underlined substance acting as a base? A HNO₃ + H₂SO₄ → H₂NO₃⁻ + HSO₄⁻ B HSiO₃⁻ + HCN → CN⁻ + H₂O + SiO₂ C HNO₂ + HCO₃⁻ → H₂O + CO₂ + NO₂⁻ D C₆H₅O⁻ + CH₃C(=O)H → C₆H₅OH + CH₃C(=O)O⁻ - CIE - A-Level Chemistry - Question 8 - 2015 - Paper 1
Step 1
In which reaction is the underlined substance acting as a base?
Answer
To determine in which reaction the underlined substance is acting as a base, we need to identify the role of the reagents in the provided reactions. A base is a species that can accept protons (H⁺). Looking at the reactions:
- Option A: HNO₃ and H₂SO₄; here H₂SO₄ donates a proton, acting more like an acid.
- Option B: HSiO₃⁻ and HCN; HSiO₃⁻ is donating a proton, not acting as a base.
- Option C: HNO₂ and HCO₃⁻; in this case, HCO₃⁻ accepts H⁺ to form H₂O and CO₂, identifying it as a base.
- Option D: C₆H₅O⁻ and CH₃C(=O)H; C₆H₅O⁻ is donating a proton in this reaction, behaving as a base.
Upon evaluation, the only reaction where the underlined substance, HCO₃⁻, acts as a base is option C.