962/1 Trial STPM 2010: Confidential / Sulit
962/1 Trial STPM 2010: Confidential / Sulit
962/1 Trial STPM 2010: Confidential / Sulit
962/1
CHEMISTRY (KIMIA)
PAPER 1 (KERTAS 1)
One hour and forty-five minutes (Satu jam empat puluh lima minit)
Instructions to candidates:
DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO.
There are fifty questions in this paper. For each question, four suggested answers are given.
Choose one correct answer and indicate it on the multiple-choice answer sheet provided.
Read the instructions on the multiple-choice answer sheet very carefully. Answer all questions.
Baca arahan pada helaian jawapan aneka pilihan itu dengan teliti.
Jawab semua soalan. Markah tidak akan ditolak bagi jawapan yang salah.
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Section A
Four suggest answers labeled A, B, C and D are given for each question. Choose one correct
answer.
A. 25.0
B. 35.0
C. 65.0
D. 75.0
Pressure/Pa
Temperature/K
2
3. Transition of electrons between energy levels in an atom will cause an absorption or
emission of light.Which energy level diagram shows the transition of electrons that emits
light with the lowest frequency?
4. The first, second, third and fourth ionization energies (in kJ mol -1) for an element Y is
given below.
The element Y forms a covalent chloride that reacts with water to give an acidic
solution.The element Y could be
A. Aluminium
B. Beryllium
C. Sulphur
D. Magnesium
3
5. The first to fourth ionisation energies of four elements are as follows.
6.Which one of the following pairs of molecular formula and molecular geometry is true?
A. SO42- Octahedral
B. PCl5 Trigonal bipyramidal
C. SO3 Tetrahedral
D. H2O Trigonal planar
7. The conductivity of a metal is due to the delocalised electrons in the conduction band. How
many electrons are found in the conduction band of a 6.0 g magnesium metal strip?
A. 3.01 x 10 23
B. 3.01 x 10 24
C. 5.02 x 10 23
D. 5.02 x 10 24
4
9. Hydrogen peroxide and iodide ion react in the presence of hydrogen ion to produce iodine and
water according to the equation.
Rate = k[H2O2]p[I-]q[H+]r
Concentration,
Mol/dm3
H2O2 I- H+
A. 0 1 2
B 1 1 0
C 1 1 2
D 2 1 0
5
10. When 0.20 mol of iodine and 0.20 of hydrogen are heated to equilibrium at 650C in a 1 dm 3
vessel, the equilibrium mixture contains 0.044 mol of iodine.
A. 0.30.
B. 19.3
C. 50.3
D. 10.3
11.Which of the following reactions is represented by the graph shown in figure which shows the
effect of pressure on percentage yield?
Pressure
(atm)
Percentage yield
A. W(g) 2 Z (g)
B. W(g) + V(g) 2 Z (g)
C. W(g) + V(s) Z(g)
D. W(g) + 2V(s) Z(g)
When m g of PCl5 is heated at a constant pressure,p and a fixed temperature,T its partial pressure
at equilibrium is 1/7 p.What is the equilibrium constant,Kp at this temperature?
A. 9/7 p
B. 18/7 p
C. 6p
D. 7p
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13. A solution contains propanoic acid and sodium propanoate. Which of the following
expressions can be used to calculate the concentration of hydrogen ions in the solution?
A. [H+] = Ka[acid]
B. [H+] = lg Ka
C. [H+] = Ka [acid]
[salt]
D. [H+] = Ka [salt]
[acid]
14. The degree of dissociation of 0.20 mol dm-3 solution of an acid HA is 0.018 %.The pH of the
acid is 1.0.What is the value of Ka (mol dm-3) for HA?
A. 0.1 x 0.1
0.2
B.0.4 x 10 -5
C 0.9 x 10-5
D.1.8 X 10-5
15.A solution containing 7 x 10-7 mol dm-3 Ag + ions is required for a reaction. Which of the
following saturated solutions can be used for this purpose?
17. If 0.125 A of electric current is passed through concentrated copper(II)sulphate solution for
5.0 hours,what mass of copper and volume of chlorine( at stp) are produced?
( 1F = 9.65 x 104 Cmol-1 ; molar volume of gas at stp = 22.4 dm3)
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18. The standard electrode potential for nickel and zinc are given below
19. The standard electrode potentials for three half-cells are given below:
J2+ /J E = - 0.44 V
L2+/L E = - 0.76 V
T2+/T E = + 0.34 V
A. J and L only
B. J,L and T
C. J2+ and L2+
D. L2+ and T only
20. Calculate the emf of a Daniell cell at 25 C if the concentration of Zn 2+(aq) is 0.25 mol dm-3
and the concentration of Cu2+(aq) is 0.15 mol dm-3.
Given that
Cu2+ + 2e = + 0.34 V
Zn2+ + 2e = - 0.76 V
A. + 1.10 V
B. + 1.09 V
C. – 1.06 V
D. - 1.09V
21. Which of the following elements belongs to Group 2 in the Periodic Table?
8
22. Aluminium chloride reacts with an ether, (CH3)2O to form a compound with the formula,
(CH3)2.AlCl3 .In this reaction aluminium acts as a
A. Lewis acid
B. Lewis base
C. Bronsted acid
D. Bronsted base
23. Aluminium is used for making carbonated soft drink cans.Which of the following is the most
important reason explaining why aluminium is used?
The tetrachloride is
A. SiCl4
B. PbCl4
C. SnCl4
D. GeCl4
25. Nitrogen oxides have high positive standard enthalpies of formation, ∆H f .Which of the
following is the major factor for the high positive value of ∆H f ?
A. Manganese
B. Chromium
C. Copper
D. Lead
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I II
27. Butan-2-ol → But-2-ene → 2- chlorobutane
I II
A H2SO4 Chlorine gas
B High concentrated H2SO4 Hydrogen chloride gas
C Liquidify HNO3 aqueous Hydrogen chloride
D Acidified KMnO4 HCl aqueous
28. Chlorination of benzene is carried out by using iron as catalyst.The function of iron in this
reaction is to produce
29. Which of the following compound is expected to have the highest boiling point?
A. CH3CH2CH2CH2Cl
B. CH3CH2CH2CH3
C. CH3CH(OH)CH2CH3
D. CH3CH2OCH2CH3
30. CH3CH2Br reacts with an aqueous solution of potassium hydroxide forming CH3CH2OH,
whereas (CH3)3CBr reacts with an ethanolic solution of potassium hydroxide forming
CH2 =C(CH3)2 as the major product. Which statement is true of the two reactions?
10
32. The structural formula of progesterone, a sex hormone, is shown as follows.
CH3
H3C C=O
H 3C
O
HH
Which of the following statements is true of progesterone?
A It has a planar ring structure.
B It has three chiral carbon atoms.
C It reacts with Fehling solution.
D It reacts with aqueous potassium manganate (VII).
A Na
B Br2 /CCl4
C concentrated H2SO4
D concentrated HCl /ZnCl2
35. Compound Z has the composition percentage by mass: carbon, 40.0%; hydrogen, 6.7%;
oxygen, 53.3%. Compound Z also has a chiral carbon atom and relative molecular mass
90.0. Which of the following statements is not true of compound Z?
[Relative atomic mass: C = 12.0, H = 1.0, O = 16.0]
36 Which of the following could not be used to differentiate between CH3CHO and
CH3COCH3?
A Tollen’s reagent
B Fehling’s solution
C Iodoform test
D Mass spectrometry
11
37. Hydrocarbons undergo various reactions. One of the reactions involving 3, 3-
dimethyloctane is shown below.
X
3,3-dimethyloctane -------- > products
X could be
A 450 C, Al2O3/SiO2
B H2SO4(conc.), 180 C
C NaOH(aq), reflux
D KCN(aq)/ ethanol, reflux
39.Plastic can be classified as thermoplastic and thermosetting plastic based on its thermal
properties. Which is a thermosetting plastic?
A. Bakelite
B. Perspex
C. Polystyrene
D. Polyvinyl chloride
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Section B
For each of the questions in this section, one or more of the three numbered statements 1 to 3 may
be correct the responses A to D should be selected as follows:
A B C D
1 only is correct 1 and 2 only are 2 and 3 only are 1,2 and 3 are correct
correct correct
41. An enzyme found in the stomach operates at a maximum efficiency when in an aqueous
solutions buffered at pH 5.Which combination of substances when dissolved in 10 dm 3 of water
give the necessary buffer solution?
42.
Boiling point
The boiling point-composition diagram for two pure liquids P and R is given above.
Which of the following statements could be correct?
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44. Which of the following reactions does the value of ∆ H represents both enthalpy change of
formation and enthalpy change of combustion ?
45. Which of the following steps in the Born-haber cycle for the enthalpy change of formation of
calcium oxide has a negative ∆ H value?
1. O(g) + e → O-(g)
2. ½ O2(g) → O (g)
3. Ca(s) → Ca(g)
47. The colour changed from pale blue to deep blue when ammonia is added to an aqueous
solution of copper(II) salt as shown in the reaction below is caused by
[Cu(H2O)6]2+ → [Cu(NH3)4]2+
OH
CH(OH)CH2NHCH3
HO
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49. Glutamine has the formula
H2N-CH-CH2CH2-CONH2
COOH
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