Chemistry · Oct / Nov 2023 · Paper 61 · Question 3
0620
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A student tests two substances: solid M and solid N. Tests on solid M Solid M is hydrated chromium(III) nitrate. Complete the expected observations.
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3(a)(i)[1]
(changes from blue to) pink
3(a)(ii)[1]
oxygen / O2
3(b)(i)[2]
M1 dropwise: green precipitate
M2 excess: dissolves
3(b)(ii)[1]
damp (red) litmus (paper) turns blue
3(c)[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(d)[2]
M1 barium / Ba2+
M2 iodide / I−
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