Chemistry · May / June 2025 · Paper 61 · Question 3
0620
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A student tests two solids: solid F and solid G. Tests on solid F Solid F is calcium carbonate. 3
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3(a)[2]
M1 limewater becomes milky
M2 effervescence / fizzing / bubbling
3(b)(i)[1]
no change
3(b)(ii)[2]
dropwise: white precipitate
excess: no (further) change / precipitate remains / white precipitate / insoluble
3(b)(iii)[1]
white precipitate
3(c)[2]
M1 potassium / K+
M2 bromide / Br–
KBr = 2
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