GCE ‘O’ Level October/November 2010 Suggested Solutions Chemistry (5072 ...
GCE `O' Level October/November 2010 Suggested Solutions
Chemistry (5072 /01) version 1.1
# Ans Workings/Remarks
1 D Refer to the periodic table, Atomic no. : 19.
2 D All sodium salts are soluble.
3
B Molecules with the same relative molecular mass diffuse at the same rate.
4 D Diamond has a high melting point because it has
strong covalent bonds between carbon atoms.
Diamond does not conduct electricity because it does not have mobile ions or electrons.
Carbon Atom
5
B
2Z3+ + 3O2- Z2O3
6
A X and Y form ionic compound with chlorine. Only covalent compound has a molecular
structure.
7
B Metal conducts electricity because it has a sea of mobile delocalised electrons.
8
B 3 Fe + 2O2 Fe3O4
No. of mole of Fe3O4
=
116 56(3)+16(4)
= 0.5
No. of mole of Fe = 0.5 ? 3
= 1.5
9 C In molten form, sodium ion is the only positive ion that presents, therefore it is discharged at
cathode.
10 B Copper electrodes are reactive electrodes, which dissolve to give copper (II) ions that replace
copper (II) ions in electrolyte that have been discharged.
11 B
12 B
13 B Acid is used up and no more Hydrogen is produced.
14 C Sodium oxide is soluble and basic.
15 A Oxidation state of sulfur increases from +4 in SO2 to +6 in SO3.
Oxidation state of oxygen increases from 0 in O2 to -2 in SO3.
16 B CO2 + C 2CO
17 B
18 C
19 B Copper and silver do not react with acid because they are less reactive than hydrogen.
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GCE `O' Level October/November 2010 Suggested Solutions
Chemistry (5072 /01) version 1.1
20 C Cracking of oil produces hydrogen.
21 A
22 B
23 B 2Cs + 2H2O 2CsOH + H2 24 C 25 D Sodium carbonate does not decompose on heating.
26 B Iron reacts with steam to give iron oxide and hydrogen.
27 D Zinc is more reactive than iron and does not react with water.
28 D
29 B Hydrogen and sulfur dioxide are not found in air, neither are they produced in the blast
furnace reaction. Steam is not produced in the blast furnace reactions.
30 D Zinc oxide is amphoteric.
31 A
32 A Carbon monoxide and nitrogen dioxide react to form harmless carbon dioxide and nitrogen.
33 B
34 D Glucose : C6H12O6
Ethanol : C2H5OH
35 C
36 C Empirical formula is the simplest ratio of the elements found in a compound. Since addition
polymerisation does not change the percentage composition of the compound, the empirical formula remains unchanged.
37 A
38 D
Pentanoic acid
+
butanol
butyl pentanoate
HHH HO
H H H H
H C C C C C OH + HO C C C C H
H H H H
H H H H
Removed
39 A Alkenes (C=C bonds) decolourise bromine, carboxylic acids (COOH bond) react with
carbonate to give carbon dioxide.
40 A Elements found in terylene (polyester) are carbon, oxygen and hydrogen.
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