Chemistry · May / June 2021 · Paper 62 · Question 3
0620
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Solution G and solid H were analysed. tests on solution G tests observations Solution G was divided into three equal portions in three test-tubes. test 1 Sodium hydroxide was added dropwise and then in excess to the first portion of solution G. white precipitate which did not dissolve in excess test 2 About 1 cm3 of dilute nitric acid followed by a few drops of aqueous silver nitrate were added to the second portion of solution G. yellow precipitate test 3 About 10 cm3 of aqueous hydrogen peroxide was added to the third portion of solution G. The gas produced was tested. the mixture became brown and bubbled; the gas relit a glowing splint
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3(a)[1]
oxygen / O2
3(b)[2]
calcium / Ca2+
iodide / I–
Tests on solid H
3(c)[2]
any 2 from:
white fumes given offcondensation at mouth of tubesolid (changes from blue and) becomes white3(d)[1]
blue-green
3(e)[3]
(light) blue precipitate
dissolves / forms a solution / soluble (in excess)
which is a darker / deep blue
3(f)[1]
white precipitate
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