Chemistry · Oct / Nov 2023 · Paper 62 · Question 3
0620
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The question as text
A student tests two substances: solid K and solid L. Tests on solid K The student dissolves solid K in water to form solution K. The student divides solution K into four portions. Table 3.1 shows the tests and the student’s observations for solution K. Table 3.1 tests observations test 1 To the first portion of solution K, add a few drops of aqueous ammonia. white precipitate test 2 To the second portion of solution K, add a few drops of acidified aqueous potassium manganate(VII). pale purple solution test 3 To the third portion of solution K, add 1 cm3 of dilute nitric acid followed by a few drops of aqueous silver nitrate. cream precipitate test 4 To the fourth portion of solution K, add aqueous chlorine. the solution becomes orange
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3(a)(i)[2]
M1 zinc / Zn2+
M2 aluminium / Al3+
3(a)(ii)[2]
M1 add excess / more ammonia
M2 for zinc ions: precipitate redissolves / colourless solution
OR
for aluminium ions: the precipitate remains / stays white / unchanged
3(b)[1]
bromide / Br–
3(c)[1]
(light / pale / apple) green (flame colour)
3(d)[1]
(red) litmus turns blue
3(e)[1]
no change / (remains) colourless / no reaction
3(f)[1]
white precipitate
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