At 30 ∘C30\,^\circ\mathrm{C}30∘C, substance R is a gas. Which data are consistent with this observation?
Melting point 40 ∘C40\,^\circ\mathrm{C}40∘C, boiling point 90 ∘C90\,^\circ\mathrm{C}90∘C
Melting point 10 ∘C10\,^\circ\mathrm{C}10∘C, boiling point 80 ∘C80\,^\circ\mathrm{C}80∘C
Melting point −20 ∘C-20\,^\circ\mathrm{C}−20∘C, boiling point 15 ∘C15\,^\circ\mathrm{C}15∘C
Melting point 35 ∘C35\,^\circ\mathrm{C}35∘C, boiling point 120 ∘C120\,^\circ\mathrm{C}120∘C
84 exam-style questions on Edexcel GCSE Chemistry 3.1 States of matter, covering 3.1.1 The three states of matter and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.