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CAIE IGCSE Chemistry 3.1.3 Deduce the Formula of a Simple Questions

Deduce molecular formulae by counting each element shown in a chemical structure.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • deduce an acid formula from its displayed structure
  • deduce a molecular formula from structural information
  • count atoms in a displayed chemical structure

CAIE IGCSE Chemistry 3.1.3 Deduce the Formula of a Simple Questions question 1

[Maximum number: 1]

Sulfur is a Group VI element.

An acid containing sulfur reacts with sodium hydroxide, NaOH , to form a salt and water. The salt has the formula Na2SO3\mathrm{Na}_{2} \mathrm{SO}_{3}.

Deduce the formula of this acid.

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