Chemistry · Oct / Nov 2025 · Paper 61 · Question 3
0620
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The question as text
A student tests two solids: solid J and solid K. Tests on solid J Solid J is lithium chloride. Record the expected observations.
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3(a)(i)[1]
red
3(a)(ii)[1]
(yellow flame) not hot enough
3(b)(i)[1]
white precipitate
3(b)(ii)[1]
no change
3(c)[1]
(solid K is) hydrated
3(d)(i)[2]
M1 Fe2+ / iron(II)
M2 Cr3+ / chromium(III)
3(d)(ii)[2]
M1 add excess aqueous sodium hydroxide
M2 chromium and forms a solution / (green) precipitate dissolves
OR
M1 add excess aqueous sodium hydroxide
M2 iron(II) and forms a (green) precipitate which doesn’t dissolve
OR
M1 add aqueous sodium hydroxide and leave to stand
M2 iron(II) and (green) precipitate becomes brown
OR
M1 add aqueous sodium hydroxide and leave to stand
M2 chromium and (green) precipitate does not turn brown
3(e)[1]
carbon dioxide / CO2
3(f)[1]
sulfate / SO42–
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