PIONEER JUNIOR COLLEGE - ASKnLearn

H2 Chemistry Paper 1 Practice 1
Duration: 1 hour
Section A
For each question, there are four possible answers labelled A, B, C and D. Choose the
one you consider to be correct.
1 Ethanedioate ions, C 2 O 4 2- , are oxidised by acidified, aqueous potassium
manganate(VII) according to the equation.
2MnO 4 - (aq) + 5C 2 O 4 2- (aq) + 16H + (aq) → 2Mn 2+ (aq) + 10CO 2 (g) + 8H 2 O(l)
What volume of 0.020 mol dm -3 potassium manganate(VII) is required to oxidise
completely 1.0 x 10 -3 mol of KH 2 C 2 O 4 .H 2 C 2 O 4 ?
A 20 cm 3
B 40 cm 3
C 50 cm 3
D 125 cm 3
2 Which of the following quantities is equal to the Avogadro’s constant?
A
B
The number of atoms in 1 dm 3 of carbon monoxide at 273 K and 1 atm.
The number of oxygen atoms in 100 g of allactite, Mn 7 (AsO 4 ) 2 (OH) 8 of molar
mass 798 g mol -1 .
C The number of ions in 165 g of K 3 Fe(CN) 6 .
D The number of ions in 168 g of Reinecke’s salt, NH 4 [Cr(NH 3 ) 2 (SCN) 4 ]
3 The proton number of an element X is 32. In which order are the electrons lost in
forming the X 4+ ion?
First Second Third Fourth
A 4p x 4p y 4s 4s
B 4p x 4p y 3d 3d
C 4p x 4p x 4s 4s
D 4p x 4p x 3d 3d
4 Which of the following statements about ammonia is true?
A It is a non-polar molecule.
B It has a trigonal planar shape.
C The H – N – H bond angle is 107°.
D It contains two lone pairs of electrons.
Prepared by Tan BP

2
5 Which of the following statements best explains why ammonia deviates from ideal
gas behaviour?
A
B
C
D
The bonds between atoms in ammonia molecules are strong.
Ammonia can be easily compressed at low temperature and high pressure.
There are strong intermolecular forces of attractions between ammonia
molecules.
The volume occupied by ammonia molecules is significant compared to the
volume occupied by the gas.
6 Iodine trichloride, ICl 3 , is made by reacting iodine with chlorine.
I 2 (s) + Cl 2 (g) → 2ICl(s) ΔH Ө = +14 kJ mol -1
ICl(s) + Cl 2 (g) → ICl 3 (s) ΔH Ө = -88 kJ mol -1
Given the data above, what is the standard enthalpy change of formation for solid
iodine trichloride?
A -60 kJ mol -1
B -74 kJ mol -1
C -81 kJ mol -1
D -162 kJ mol -1
7 When water is stirred with glucose, strong hydrogen bonds are initially formed
between glucose molecules and water molecules, but as more water is added, these
hydrogen bonds are broken.
Which graph best represents the observed temperature changes?
A
temperature
B
temperature
C
temperature
D
temperature
0
volume of
water added
0
volume of
water added
0
volume of
water added
0
volume of
water added

3
8 The e.m.f. of four cells constructed using four metals S, T, U and V measured at
25°C for 1.0 mol dm -3 solutions are given below.
reaction
2U + + S ⇌ 2U + S 2+
U + + V ⇌ U + V +
2V + T 2+ ⇌ 2V + + T
S 2+ + T ⇌ T 2+ + S
E Ө cell / V
+0.30
+3.50
+2.27
+0.96
Which of the following is the strongest reducing agent?
A
B
C
D
S
T
U
V
9 The diagram below shows the apparatus set-up for an electrolysis experiment.
Copper
Graphite
CuSO 4 (aq)
What happens at the anode and cathode?
Anode
Cathode
A Hydrogen is produced. Copper is deposited.
B Copper is deposited . Oxygen is produced.
C Copper is deposited . Hydrogen is produced.
D Copper dissolves. Copper is deposited.
10 Two equilibria are shown below.
Reaction I:
X 2 (g) + Y 2 (g) ⇌ 2XY(g)
Reaction II: XY(g) ⇌ ½X 2 (g) + ½Y 2 (g)
The numerical value of K c for reaction I is 2. Under the same conditions, what is the
numerical value of K c for reaction II?
A 2 B
1
2
C
1
2
D 2

4
11 The graph below shows the change in pH when 0.10 mol dm -3 acid is gradually
added to 10 cm 3 of 0.20 mol dm -3 alkali.
Which of the following substances could have given these results?
alkali
acid
A Ba(OH) 2 CH 3 COOH
B Ba(OH) 2 H 2 SO 4
C NaOH CH 3 COOH
D NH 3 HCl
12 Iodide ions react with peroxodisulfate ions to form iodine and sulfate.
2I - + S 2 O 8
2-
→ I 2 + 2SO 4
2-
The reaction was found to be first order with respect to I- and S 2 O 8 2- . At temperature
T, the rate constant was determined to be 0.200 mol -1 dm 3 s -1 .
2-
What is the half life of the reaction when S 2 O 8 with an initial concentration of
0.500 mol dm -3 was made to react with I - with an initial concentration of
0.010 mol dm -3 at the same temperature?
A 3.47 s B 6.93 s C 347 s D 693 s
13 The table shows experimental results obtained for the rate of the following reaction.
2XO(g) + O 2 (g) → 2XO 2 (g)
Partial pressure of XO
(arbitrary units)
100 50 75 25
Partial pressure of O 2
(arbitrary units)
100 100 25 -
Relative rate 1.0 0.50 0.19 0.063
What is the missing value of the partial pressure of O 2 in the table?
A 12.5 B 25.2 C 50.0 D 75.0

5
14 An element M can exist in its oxide and chloride form. The oxide of M is insoluble in
water. The chloride of M hydrolyses in water to form an acidic solution. What could M
be?
A
B
C
D
Na
Mg
Si
P
15 The solubilities (at 20°C) of calcium sulfate and barium sulfate are given below.
Compound Solubility / g per 100 g of water
CaSO 4 2.3 x 10 -1
BaSO 4 2.3 x 10 -4
Which of the following statements best explains the above data?
A The size of Ba 2+ cation is bigger than that of Ca 2+ cation.
B The magnitude of lattice energy of BaSO 4 is larger than that of CaSO 4 .
C The magnitude of ionisation energy of barium is smaller than that of calcium.
D The magnitude of hydration energy of Ba 2+ cation is lower than that of Ca 2+
cation.
16 The solubility of the silver halides in aqueous ammonia decreases from AgCl to AgI.
Which of the following helps to explain this trend?
A The covalent bonding between Ag and the halogen atom increases in strength
from AgCl to AgI.
B As a more powerful ligand, NH 3 can displace Cl - ions and Br - ions, but not I -
ions.
C The value of solubility product of the silver halides decreases from AgCl to AgI.
D Cl – ions and Br – ions form complexes with NH 3 (aq), but I – ions do not.
17 An aqueous solution containing both potassium chloride and potassium iodide is
treated with excess of aqueous silver nitrate. The precipitate formed is filtered off and
washed with distilled water. The precipitate is then shaken with aqueous ammonia
and filtered off again.
Which ion is present in the final filtrate?
A
B
C
D
chloride
iodide
potassium
silver

6
18 0.267 g of a compound of chromium with general formula CrCl 3 .6H 2 O dissolves in
water to form an aqueous solution. When this solution is treated with excess of
aqueous silver nitrate, 0.144 g of silver chloride is precipitated.
Which of the following represents the structure of the chromium ion present in the
original compound?
A Cr 3+ (aq)
B [Cr(H 2 O) 5 Cl] 2+
C [Cr(H 2 O) 4 Cl 2 ] +
D [Cr(H 2 O) 6 ] 3+
19 In which of the following sets of reagents used does the transition metal compound
behave as a catalyst?
A
B
C
D
ethanal, copper(II) sulphate, sodium potassium tartrate, sodium hydroxide
ethene, sulfuric acid, potassium manganate(VII)
benzene, bromine, iron(III) bromide
phenol, iron(III) chloride
20 Which statement concerning transition metals is correct?
A They are the only metals which form complex compounds.
B They are the only metals with a complete 4s orbital in their atoms.
C They are the only metals which have more than one oxidation state.
D They are the only metals which give coloured ions in an aqueous solution.
21 How many stereoisomers are possible for the compound shown below?
C(CN)CH 3
HO
A 2 B 4 C 8 D 16

7
22 The antibacterial drug tetracycline has the following formula.
H 3 C OH
N(CH 3 ) 2
OH
OH
O
OH
OH O
CONH 2
How many chiral centres are there in the molecule?
A 4 B 5 C 6 D 7
23 Which sequence shows the nitrogen compounds in decreasing order of basic
strength?
A C 2 H 5 NH 2 > NH 3 > (C 2 H 5 ) 2 NH
B C 2 H 5 NH 2 > (C 2 H 5 ) 2 NH > C 6 H 5 NH 2
C (C 2 H 5 ) 2 NH > NH 3 > C 6 H 5 NH 2
D C 6 H 5 NH 2 > NH 3 > C 2 H 5 NH 2
24 Which of the following pairs of compounds can be distinguished by visual observation
of the reaction on warming with an acidified solution of potassium manganate(VII)?
A HCO 2 H and (CO 2 H) 2
B CH 3 CH 2 CH 2 OH and CH 3 CH(OH)CH 3
C CH 3 CH 2 CO 2 H and CH 3 CO 2 C(CH 3 ) 3
D CH 3 CH 2 CH 2 CH 2 CH 3 and C 6 H 5 CH 2 CH 3
25 Acetaminophen is a drug used in headache remedies.
HO
CH 3
NH C O
acetaminophen
Which of the following about acetaminophen is true?
A
B
C
D
It is soluble in water
It reacts with PCl 3 to give dense white fumes
It forms a yellow precipitate with alkaline iodine solution.
It reacts with both sodium and aqueous sodium hydroxide.

26 2,4-D and MCPA are two common weed killers.
8
OCH 2 CH 2 OH
O
OCH 2 C
OH
Cl Cl
Cl
CH 3
2,4-D
MCPA
Which of the following reagents can be used to distinguish between them?
A
B
C
D
sodium metal
2,4-dinitrophenylhydrazine
aqueous sodium carbonate
hot acidified potassium manganate(VII)
27 Compound Y forms an orange precipitate with 2,4-dinitrophenylhydrazine. However,
it does not react with Fehling’s solution. The reaction of Y with HCN yields a product
which contains a chiral centre.
Which of the following could be compound Y?
A
B
C
D
diphenylketone
benzaldehyde
phenylmethanol
2-phenylethanal
28 A commercial use of chloroethanoic acid is in the manufacture of the herbicide
2,4,5–T which can be synthesised from 1,2,4,5-tetrachlorobenzene by the following
route.
Cl
Cl
excess NaOH
Cl
Cl
NaOH
Cl
Cl
ClCH 2
CO 2
H
Cl
Cl
Cl
Cl
high temp
I
Cl
OH
Cl
O - Na +
II
Cl
OCH 2 CO 2 H
1,2,4,5-tetrachlorobenzene
2,4,5-T
Which of the following statement about the compounds and their reactions is correct?
A
B
C
D
Reaction I involves electrophilic substitution.
Reaction II involves nucleophilic substitution.
2,4,5–T is readily hydrolysed by aqueous NaOH.
1,2,4,5-tetrachlorobenzene forms a white precipitate with hot aqueous silver
nitrate.

9
29 The reduction of a nitrile E produced a compound with molecular formula
CH 3 CH 2 CH 2 NH 2 . The same nitrile E was also subjected to acid hydrolysis. What
would be formed when the products from the two reactions were mixed?
A CH 3 CONHCH 2 CH 2 CH 3
B CH 3 CH 2 CONHCH 2 CH 2 CH 3
C (CH 3 CO 2
- )(CH3 CH 2 CH 2 NH 3 + )
D (CH 3 CH 2 CO 2
- )(CH3 CH 2 CH 2 NH 3 + )
30 Which of the following compounds forms a solution of the lowest pH when equimolar
quantities are dissolved in water?
A CH 3 CH 2 CO 2 H
B CH 3 CHClCO 2 H
C CH 3 CH 2 COCl
D C 6 H 5 CO 2 H

10
Section B
For each of the next 10 questions, one or more of the three numbered statements 1 to 3
may be correct.
Decide whether each of the statements is or is not correct (you may find it helpful to put a
tick against the statements which you consider to be correct).
The responses A to D should be selected on the basis of
A B C D
1, 2 and 3 are 1 and 2 only are 2 and 3 only are 1 only is correct
correct
correct
correct
No other combination of statements is used as a correct response.
31 What factors contribute to the lattice energy of magnesium fluoride being numerically
greater than that of magnesium chloride?
1 Radius of fluoride ion is smaller than that of chloride ion.
2 Fluorine is more electronegative than chlorine.
3 The magnitude of the enthalpy change of hydration of fluoride ions is greater
than that of chloride ions.
32 Consider the following two half-cells.
Cd 2+ (aq) + 2e ⇌ Cd(s)
Ag + (aq) + e ⇌ Ag(s)
E Ө = -0.40 V
E Ө = +0.80 V
Which of the following statements are correct?
1 Ag + is a stronger oxidising agent than Cd 2+ .
2 The potential of Cd electrode relative to Ag electrode is -1.20 V.
3 Electrons will flow in the external circuit from Ag to Cd when the two half-cells
are connected.
33 The use of Data Booklet is relevant to this question.
When 386 C of electricity are passed through a molten compound of a metal,
2.00 × 10 -3 mol of atoms of the metal is deposited at the cathode. What could the
metal be?
1 copper
2 tin
3 silver

11
The responses A to D should be selected on the basis of
A B C D
1, 2 and 3 are 1 and 2 only are 2 and 3 only are 1 only is correct
correct
correct
correct
No other combination of statements is used as a correct response.
34 The equation for the synthesis of nitrogen monoxide is given below.
N 2 (g) + O 2 (g) ⇌ 2NO(g)
∆H positive
Which of the following conditions will give a higher equilibrium yield of nitrogen
monoxide?
1 a higher temperature
2 a higher pressure
3 a suitable catalyst
35 The following graph shows the uncatalysed energy profile for the reaction R ⇌ S + T.
Enthalpy / kJ mol -1
E 1
R
S + T
E 2
Which of the following statements are true?
1 The value of E 1 can be changed by addition of catalyst but not that of E 2 .
2 The enthalpy change of reaction is E 1 – E 2 .
3 The energy profile above will not change when the concentration of R is
changed.
36 Fibre glass can be considered to be a mixture of ionic oxides and giant covalent
oxides.
Which of the following could be constituents of fibre glass?
1 Al 2 O 3
2 SiO 2
3 P 4 O 6

12
The responses A to D should be selected on the basis of
A B C D
1, 2 and 3 are 1 and 2 only are 2 and 3 only are 1 only is correct
correct
correct
correct
No other combination of statements is used as a correct response.
37 Which statements about the trend in properties of the halogens are correct?
1 The first ionisation energy decreases on descending down the group.
2 The electronegativity decreases on descending down the group.
3 The volatility decreases on descending down the group.
38 Which compounds would not be formed in the reaction of ethane with chlorine in the
presence of light?
1 CH 3 CH 2 CH 3
2 CH 3 CH 2 CH 2 CH 3
3 CH 3 CHCl 2
39 Which of the following statements are true about the amino acid tyrosine?
NH 2
HO
CH 2 CH
CO 2 H
Tyrosine
1 At pH 13, the amino acid migrates to the anode.
2 The amino acid exhibits stereoisomerism.
3 The amino acid reacts with neutral FeCl 3 to form a complex.
40 Compound Z has the structural formula as shown below.
H
O
N
O
Which of the following statements regarding Z are correct?
1 Z liberates ammonia gas on reaction with hot aqueous sodium hydroxide.
2 Z gives an orange precipitate when it is treated with 2,4-dinitrophenylhydrazine.
3 Heating Z with hydrochloric acid yields an amino acid.
End of Paper

13
H2 Chemistry Paper 1 Practice 1 Answers
1 B 11 C 21 B 31 D
2 D 12 B 22 B 32 B
3 A 13 B 23 C 33 B
4 C 14 C 24 D 34 D
5 C 15 D 25 D 35 C
6 C 16 C 26 C 36 B
7 C 17 A 27 B 37 A
8 D 18 C 28 B 38 D
9 D 19 C 29 D 39 A
10 B 20 D 30 C 40 D