Chemistry · May / June 2025 · Paper 62 · Question 3
0620
As printed in the paper
The question as text
A student tests two solids: solid J and solid K. Tests on solid J Solid J is iron(II) iodide. The student dissolves solid J in water to form solution J. Solution J is divided into four portions.
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Show the answer and mark scheme
3(a)[2]
dropwise: green precipitate
excess: no (further) change / precipitate remains / green precipitate / insoluble
3(b)[1]
no change
3(c)[1]
yellow precipitate
3(d)[1]
(solution / liquid becomes) yellow / orange / brown
3(e)[1]
does not contain ammonium / NH4+ ions / not ammonium / NH4+
3(f)[1]
ammonia / NH3
3(g)[2]
potassium / K+
nitrate / NO3–
KNO3 = 2
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