Chemistry · May / June 2023 · Paper 61 · 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 Table 3.1 shows the tests and the student’s observations. Table 3.1 tests observations test 1 Gently heat half of solid E in a boiling tube. a solution forms, steam is given off and condensation forms at the top of the tube test 2 Dissolve the remaining solid E in water to form solution E. Divide solution E into three portions. To the first portion of solution E, add aqueous sodium hydroxide dropwise and then in excess. a brown precipitate forms which remains when excess is added test 3 Warm the product of test 2 and test any gas produced. the gas turns red litmus paper blue test 4 To the second portion of solution E, add 1 cm depth of dilute nitric acid followed by a few drops of aqueous silver nitrate. no change test 5 To the third portion of solution E, add 1 cm depth of dilute nitric acid followed by a few drops of aqueous barium nitrate. white precipitate
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Show the answer and mark scheme
3(a)[1]
hydrated / contains water
3(b)[1]
ammonia / NH3
3(c)[1]
solid C does not contain chloride, bromide or iodide ions
3(d)[3]
M1 ammonium / NH4+
M2 iron(III) / Fe3+
M3 sulfate / SO42-
3(e)[2]
M1 white precipitate
M2 dissolves / forms a colourless solution
3(f)[1]
(pink/purple / lilac solution) becomes colourless / decolourised
3(g)[1]
no change / remains colourless
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