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2.1 Purity and separating mixtures

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Question 16

A materials laboratory checks four portions of the same crystalline solid supplied for use in ceramic glaze. The portions contain different amounts of impurity.

PortionMelting temperature (∘C^\circ\mathrm{C}∘C)
A119 to 121
B112 to 118
C117 to 120
D115 to 119

Which portion is most likely to contain the greatest amount of impurity?

[1]
A

Portion B

B

Portion C

C

Portion D

D

Portion A

Markscheme

2.1 Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /2.1 Purity and separating mixtures

102 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.

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