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Purity and separating mixtures

Purity and separating mixtures

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Question 15

Four fractions obtained from a liquid mixture have the melting and boiling point ranges shown in the table below.

FractionMelting point range (∘C)Boiling point range (∘C)W−98 to −9560 to 80X−115 to −110−42 to −30Y15 to 22125 to 140Z−50 to −4585 to 105 \begin{array}{|c|c|c|} \hline \text{Fraction} & \text{Melting point range } (^\circ\text{C}) & \text{Boiling point range } (^\circ\text{C}) \\ \hline \textbf{W} & -98 \text{ to } -95 & 60 \text{ to } 80 \\ \hline \textbf{X} & -115 \text{ to } -110 & -42 \text{ to } -30 \\ \hline \textbf{Y} & 15 \text{ to } 22 & 125 \text{ to } 140 \\ \hline \textbf{Z} & -50 \text{ to } -45 & 85 \text{ to } 105 \\ \hline \end{array} FractionWXYZ​Melting point range (∘C)−98 to −95−115 to −11015 to 22−50 to −45​Boiling point range (∘C)60 to 80−42 to −30125 to 14085 to 105​​

Which fraction is collected at the top of the fractional distillation column?

A

Fraction W

B

Fraction X

C

Fraction Y

D

Fraction Z

Markscheme

Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /Purity and separating mixtures

46 exam-style questions on OCR GCSE Chemistry Purity and separating mixtures. Each one has a worked solution and a mark scheme showing where the marks go.

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