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CAIE IGCSE Chemistry 7.1.6 Aqueous Solutions of Acids Contain H Questions

Identify H⁺ as the ion causing acidity and OH⁻ as the ion causing alkalinity, linking them to pH and aqueous conductivity.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • identify hydrogen ions, H⁺, as the species responsible for acidity in aqueous solution
  • identify hydroxide ions, OH⁻, as the species responsible for alkalinity in aqueous solution
  • link H⁺ or OH⁻ concentration to pH and indicator behaviour
  • use ion evidence to explain why strong acids and alkalis conduct electricity

CAIE IGCSE Chemistry 7.1.6 Aqueous Solutions of Acids Contain H Questions question 1

[Maximum number: 1]

Burning fossil fuels releases sulfur dioxide which leads to acid rain.
Which ion in the rain water causes it to be acidic?

A

H+\mathrm{H}^{+}

B

OH−\mathrm{OH}^{-}

C

O2−\mathrm{O}^{2-}

D

SO42−\mathrm{SO}_{4}{ }^{2-}

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