Chemistry · Oct / Nov 2021 · Paper 61 · Question 3
0620
As printed in the paper
The question as text
Solution Y and solution Z were analysed. The following tests were done on the solutions. tests on solution Y tests observations Solution Y was divided into four portions in four test‑tubes. test 1 A strip of universal indicator paper was dipped into the first portion of solution Y. the universal indicator paper turned blue test 2 Aqueous copper(II) sulfate was added to the second portion of solution Y. a blue precipitate formed test 3 A flame test was done using the third portion of solution Y. a red flame was seen test 4 2 cm3 of dilute sulfuric acid was added to the fourth portion of solution Y. no visible change; the test‑tube became slightly warmer
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
3(a)[1]
11–14
3(b)[2]
lithium / Li+
hydroxide / OH-
3(c)[2]
(from) purple
(to) colourless
3(d)[1]
sulfur dioxide / SO2
3(e)[1]
(red) litmus turns blue
3(f)[1]
ammonia / NH3
3(g)[1]
no change / no reaction
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.