Chemistry · May / June 2024 · Paper 61 · Question 3
0620
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A student tests two substances: solution E and solid F. Tests on solution E Solution E is aqueous chromium(III) bromide. Solution E is divided into two portions. Record the expected observations.i
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3(a)[2]
M1 green precipitate
M2 precipitate dissolves (giving a green solution) / soluble (in excess) / precipitate disappears
3(b)[1]
cream precipitate
3(c)[2]
M1 anhydrous copper(II) sulfate
M2 (changes from white to) blue
OR
M1 anhydrous cobalt(II) chloride
M2 (changes from blue to) pink
3(d)[1]
flame test
3(e)[1]
sulfate / SO42–
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