Chemistry · May / June 2023 · Paper 42 · Question 2
0620
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The question as text
Fluorine, chlorine and bromine are in Group VII of the Periodic Table.
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2(a)[1]
halogen(s)
2(b)[1]
same number of outer shell electrons
2(c)[3]
gas
M1 pale yellow-green
gas
M2 red-brown
M3 both gases
2(d)(i)[1]
nucleon number / mass number
2(d)(ii)[3]
79Br
81Br–
protons
35
35
neutrons
44
46
electrons
35
36
Each row ✔
2(d)(iii)[2]
M1 79 × 55(%) + 81 × 45(%)
M2 7990 / 100 = 79.9
2(e)(i)[2]
Cl2 + 2KBr → 2KCl + Br2
M1 KCl as product
M2 correct equation
2(e)(ii)[1]
chlorine less reactive than fluorine
2(f)(i)[1]
white precipitate
2(f)(ii)[3]
Ag+(aq) + Cl –(aq) → AgCl(s)
M1 AgCl as only product
M2 Ag+ + Cl – as only reactants (in 1 : 1 ratio)
M3 state symbols
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