Chemistry · Oct / Nov 2024 · Paper 62 · Question 3
0620
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The question as text
A student tests two substances: solid M and solid N. Tests on solid M Table 3.1 shows the tests and the student’s observations for solid M. Table 3.1 tests observations test 1 Do a ¯ame test on solid M. lilac ¯ame colour test 2 Dissolve the rest of solid M in water to form solution M. Divide solution M into four portions. To the rst portion of solution M, add 1 cm3 of dilute nitric acid followed by a few drops of aqueous silver nitrate. a cream precipitate forms test 3 To the second portion of solution M, add aqueous sodium hydroxide dropwise and then in excess. a green precipitate forms; the precipitate remains when excess aqueous sodium hydroxide is added test 4 To the third portion of solution M, add 1 cm3 of aqueous sodium hydroxide and a small square of aluminium foil. Warm the mixture and test any gas produced with damp red litmus paper. litmus paper remains red test 5 To the fourth portion of solution M, add 1 cm3 of dilute nitric acid followed by a few drops of aqueous barium nitrate. a white precipitate forms
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Show the answer and mark scheme
3(a)[1]
(the yellow flame) is not hot enough
OR
(the yellow flame) masks the colour caused by the metal ion
3(b)[4]
M1 iron(II) / Fe2+
M2 potassium / K+
M3 bromide / Br–
M4 sulfate / SO42–
3(c)[2]
M1 effervescence / fizzing / bubbles
M2 limewater turns milky
3(d)[1]
(damp red) litmus (paper) turns blue
3(e)[1]
no change
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