Chemistry · May / June 2023 · Paper 62 · Question 3
0620
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The question as text
A student tests two substances: solution F and solid G. Tests on solution F Table 3.1 shows the tests and the student’s observations for solution F. The student divides solution F into three portions. Table 3.1 tests observations test 1 Do a flame test on the first portion of solution F. light green colour test 2 To the second portion of solution F, add a 1 cm depth of aqueous sodium hydroxide and a piece of aluminium foil. Warm the mixture gently and test any gas produced. effervescence was seen; the gas turned damp red litmus paper blue test 3 To the third portion of solution F, add a 1 cm depth of dilute nitric acid followed by a few drops of aqueous silver nitrate. no changel
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3(a)[2]
M1 use of a wire / splint to get substance into a flame
M2 putting sample INTO flame and identifying (Bunsen) flame as roaring / blue / non-luminous / hot
3(b)[1]
ammonia / NH3
3(c)[2]
M1 barium / Ba2+
M2 nitrate / NO3–
3(d)[1]
white precipitate
3(e)[2]
M1 fizzing / bubbles / effervescence
M2 limewater becomes milky
3(f)[2]
M1 green precipitate
M2 remains in excess / does not dissolve / green precipitate
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