Chemistry · Oct / Nov 2025 · Paper 62 · Question 3
0620
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The question as text
A student tests two solids: solid E and solid F. Tests on solid E Solid E is ammonium sulfate. Record the expected observations. The student dissolves solid E in distilled water to form solution E. The student divides solution E into three approximately equal portions. 3
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Show the answer and mark scheme
3(a)(i)[1]
(damp red) litmus (paper) turns blue
3(a)(ii)[1]
ammonia / NH3
3(b)[1]
white precipitate
3(c)[1]
(solution) becomes pink
3(d)[3]
M1 sodium / Na+
M2 zinc / Zn2+
M3 iodide / I–
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