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4.1 Predicting chemical reactions

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Question 11
F

Chromium is a transition metal. It forms Cr2+\mathrm{Cr^{2+}}Cr2+ ions and Cr3+\mathrm{Cr^{3+}}Cr3+ ions.

The sulfate ion is SO42−\mathrm{SO_{4}^{2-}}SO42−​.

What is the formula of the chromium sulfate that contains Cr3+\mathrm{Cr^{3+}}Cr3+ ions?

[1]
A

CrSO4\mathrm{CrSO_{4}}CrSO4​

B

Cr2(SO4)3\mathrm{Cr_{2}(SO_{4})_{3}}Cr2​(SO4​)3​

C

Cr3(SO4)2\mathrm{Cr_{3}(SO_{4})_{2}}Cr3​(SO4​)2​

D

Cr(SO4)3\mathrm{Cr(SO_{4})_{3}}Cr(SO4​)3​

Markscheme

4.1 Predicting chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /4.1 Predicting chemical reactions

60 exam-style questions on OCR GCSE Chemistry 4.1 Predicting chemical reactions, covering 4.1.1 Properties and trends in Groups 1, 7 and 0, 4.1.2 Properties of the transition metals, 4.1.3 Reactivity predicted from position in the Periodic Table, and 4.1.4 Reactivity of metals and the reactivity series. Each one has a worked solution and a mark scheme showing where the marks go.

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