NANYANG TECHNOLOGICAL UNIVERSITY SINGAPORE
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1 NANYANG TECHNOLOGICAL UNIVERSITY SINGAPORE INSTRUCTIONS ENTRANCE EXAMINATION CHEMISTRY (Sample) Time Allowed : 2 hours 1. This paper consists of TWO (2) Sections and comprises EIGHT (8) pages. 2. Answer ALL the questions in Section A and Section B. 3. For Section A, each multiple choice question carries 2 marks. Section B consists of 3 questions (total 40 marks). SECTION A This section consists of THIRTY (30) multiple choice questions. Answer ALL questions in this section. 1. Which of the following has no permanent dipole moments? a. CHCl 3 b. CH 2 Cl 2 c. C 2 Cl 4 d. C 2 HCl 3 2. Which is the most abundant element in the universe? a. Hydrogen b. Helium c. Carbon d. Oxygen 3. Which one of the following equilibrium mixture will not be affected by a change in pressure? a. CH 3 CH 2 CH 2 OH(g) CH 3 CH=CH 2 (g) + H 2 O(g) b. BaCO 3 (s) BaO(s) + CO 2 (g) c. H 2 (g) + Cl 2 (g) 2HCl(g) d. O 2 (g) + 2Hg(l) 2HgO(s) 1
2 4. Calcium with elemental chlorine yields calcium chloride. Write a balanced chemical equation for this reaction. a. Ca(s) + Cl2(g) CaCl(s) + Cl(g) b. Ca(s) + Cl2(g) CaCl2(s) c. Ca(s) + 2 Cl2(g) CaCl4(s) d. 2 Ca(s) + Cl2(g) 2 CaCl(s) 5. On heating, 0.09 mole of an element M reacts with mole of oxygen gas. The empirical formula of the oxide of M is a. M 2 O 2 b. M 3 O 2 c. M 4 O 6 d. M 2 O 3 6. Given that ΔH 0 f (FeCl 2 (s)) = kj/mol and that ΔH 0 f (FeCl 3 (s)) = kj/mol, what is ΔH rxn for the reaction: FeCl 2 (s) + ½ Cl 2 (g) FeCl 3 (s) a kj b kj c. 0 kj d kj 7. Iron has a atomic number of 26. What is the electron configuration of the iron in FeCl 3? a. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 3 4s 2 b. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 6 c. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 d. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 6 4s 2 8. A microwave oven emits radiation at a wavelength of cm. What is the frequency of this radiation? a s -1 b s -1 c s -1 d s The radioactive decay of sodium-24 has a half-life of hours. How many grams of the radioactive sodium-24 will be left after 73 hours if the initial weight of the sample is 4g? a g b g c g d. 0.26g 2
3 10. Use the following information to answer the question below: Sn 2+ (aq) + 2e Sn(s) E0 = V Sn4+(aq) + 2e Sn2+(s) E0 = V Fe2+(aq) + 2e Fe(s) E0 = V Fe3+(aq) + e Fe2+(aq) E0 = V Under standard conditions, which of the following statements is correct? a. Sn(s) can reduce Fe(s) b. Fe(s) can oxidize Sn 2+ (aq) c. Sn 2+ (aq) can reduce Fe 3+ (aq) d. Fe 3+ (aq) can reduce Sn 4+ (aq) 11. What is the ph of a solution of HNO 3 with a concentration of M? a b c d The maximum number of electrons in the shell having the principle quantum number of n = 3 is a. 18 b. 26 c. 28 d The hybridization of the nitrogen atom in the molecule NF 3 is a. sp 2 b. spd c. sp 3 d. sp 3 d 14. Which of the following statements is true about the elements in Group II of the Periodic Table? a. The ionic radius decreases down the group b. The electronegativity decreases down the group c. They form stable oxidation states of two and four d. The atomic radius increases down the group 3
4 15. The oxidation number of Chromium in the ion CrO 4 2- a. +4 b. +7 c. +6 d Which of the following compounds would react most rapidlywith NaCN? a. 1-bromobutane b. (R)-2-bromobutane c. (S)-2-bromobutane d. 1-bromo-2-methylpropane 17. The following reaction can be classified as O 200 C + CH 3 CO 2 H O CH 3 a. eminination b. substitution c. oxidation d. rearrangement 18. Reaction of benzene with benzoyl chloride and aluminium trichloride will give as the product: a. benzophenone b. chlorobenzene c. no reaction d. benzoic acid 19. What will be the product(s) of the following reaction: NaOMe, MeOH, 20 C MeO OMe MeO OMe a. (iii) only b. (ii) only c. (i) and (ii) d. (i), (ii) and (iii) (i) (ii) (iii) 4
5 20. What will be the product(s) of the following reaction KOH, EtOH, 80 C a. (i) only b. (ii) only c. (ii) and (iii) d. (iii) only OH (i) (ii) (iii) 21. Phosphorus forms three well known compounds containing chlorine: phosphorus trichloride (PCl 3 ), phosphorus pentachloride (PCl 5 ) and phosphorus oxychloride (POCl 3 ). What are the oxidation numbers of phosphorus in the compounds? PCl 3 PCl 5 POCl 3 a b c d Which of the following is the formula for a covalent network? a. N 2 O 4 b. P 4 O 10 c. CO 2 d. SiO Which of the following is a pure compound? a. Milk b. Ice cream c. Lava d. Distilled water 24. Which of the following electron configurations represents the ground state of an element? a. [Ne]3s 1 3p 1 b. [He]2s 1 2p 3 c. [Ne]3s 2 3p 3 3d 1 d. [Ne]3s 2 3p Formic acid (HCO 2 H) has K a = What is the value of K b for the formate ion (HCO 2 )? a b
6 c d Which of the following molecules/ions has non-zero dipole moments? a. cis-hclc=chcl b. O 2 c. BF 3 d. ICl An increase in temperature increases the reaction rate because a. a greater fraction of the collisions have the correct orientation of molecules b. the activation energy of the reaction will decrease. c. temperature acts as a catalyst in chemical reactions. d. more collisions will have enough energy to exceed the activation energy. 28. Calculate the equilibrium constant for the reaction using the provided equilibrium concentrations. H 2 (g) + I 2 (g) 2 HI(g) [H 2 ] = mol L 1, [I 2 ] = mol L 1, [HI] = mol L 1 a b c. 37 d In the following reaction: HF(aq) + HPO 4 2 (aq) F (aq) + H 2 PO 4 (aq) a. HF is an acid and F is its conjugate base. b. HF is an acid and HPO 4 2 is its conjugate base. c. HPO 4 2 is an acid and H 2 PO 4 is its conjugate base. d. H 2 PO 4 is an acid and F is its conjugate base. 6
7 30. The ionization energies (IE) of Ti are as follows: I II III IV V ev Stable oxidation states are expected when the difference in successive IE's exceeds 12 ev for valence electrons. What stable oxidation states are expected for Ti? a. Ti(I) only b. Ti (I) and Ti(V) c. Ti(I), Ti(II) and Ti(IV) d. Ti(II), Ti(III) and Ti(IV) SECTION B This section consists of FOUR (4) questions. Answer ALL questions in this section. This sample paper only shows 3 questions for reference only. 1. (a) Using dots to represent electrons, draw the electron distribution diagram (Lewis structure) of ClF 3. Use Valence Shell Electron Pair Repulsion theory (VSEPR) to explain the shape of this molecule. (b) Draw and label all the valence orbitals found in chlorine atom. 2. Data for the reaction 2 NO(g) + O 2 (g) 2 NO 2 (g) are given in the table. Concentration (mol/l) Initial Rate Experiment [NO] [O 2 ] (mol/l h) ? (a) Determine the rate constant and write down the rate equation for the above reaction. (b) What is the initial rate of the reaction in experiment 4? 3. (a) Discuss the difference in reactivity between the following pairs of compounds under the conditions given (i) benzene and phenol with bromine (ii) 1-hexanol and 2-hexanol with chromium trioxide in acid (iii) ethylamine and acetamide with dilute hydrochloric acid 7
8 (iv) sodium methoxide and sodium t-butoxide with 1-bromopropane (b) How would you carry out the following transformation? More than one step may be required. O OH OH - END OF PAPER - 8
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