The formula of the sulfate ion is SO42−\text{SO}_4^{2-}SO42−.
Which of the following is the formula of chromium(III) sulfate containing the Cr3+\text{Cr}^{3+}Cr3+ ion?
CrSO4\text{CrSO}_4CrSO4
Cr2(SO4)3\text{Cr}_2(\text{SO}_4)_3Cr2(SO4)3
Cr3(SO4)2\text{Cr}_3(\text{SO}_4)_2Cr3(SO4)2
Cr2S3O12\text{Cr}_2\text{S}_3\text{O}_{12}Cr2S3O12
Practise Edexcel GCSE Chemistry Ionic bonding with exam-style questions for Foundation and Higher tier. 42 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.