Chemistry · May / June 2022 · Paper 42 · Question 4
0620
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Fluorine and chlorine are halogens.l
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4(a)[1]
(pale) yellow and gas
4(b)[3]
Method 1
M1 S 25.2 / 32 or 0.78/0.79 …
and
F 74.8 / 19 or 3.93 / 3.94…
M2 ÷ both by 0.7875 = 1 : 5 or SF5
M3 (254 ÷ 127 = 2 and) S2F10
Method 2
M1 254 × 25.2/100 and 254 × 74.8 / 100 OR ‘64’ and ‘190’
M2 64 / 32 and 190 / 19
M3 (2 and 10) to give S2F10
4(c)[3]
N with 1 dot-cross bonding pair with each Cl
2 non-bonding dots for N
6 non-bonding crosses for Cl
4(d)[3]
two crosses in first shell of Li
7 dots and 1 cross in third shell of Cl
‘+’ charge on Li on correct answer line and ‘–‘ charge on Cl ion on correct answer line
4(e)[3]
ionic bonds in LiCl
attraction between molecules in NCl3
weaker attraction (between particles) in NCl3 ORA
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