Welcome to your Chemistry 2005
1.
Which of the following is NOT a basic SI unit?
2.
Which of the following statements is TRUE?
3.
Which of the following ionic compounds is formed from the reaction between magnesium and nitrogen?
4.
Which of the following molecules represents a non-polar covalent bond?
5.
Which of the following groups in the periodic table has paramagnetic atoms?
6.
How many types of cubic unit cells are known?
7.
What is the process that converts liquid vegetable oils to solid fats?
8.
What would be the solubility of HOCH2(CH2)6CH2OH compared to CH3(CH2)6CH2OH?
9.
Which of the following gases is manufactured using the Haber process?
10.
Which one of the mixture of the following pairs will NOT give a buffer solution?
11.
Which one of the following is TRUE for salts formed from strong acids and strong bases?
12.
Which of the following metals is NOT obtained by commercial electrolytic process?
13.
Which of the following metals has the highest electrical and thermal conductivities?
14.
Enthalpy is defined as the heat content of the system at constant:
15.
Which of the following elements is the second most abundant element in the earth's crust?
16.
Which of the following plant nutrient will be produced as a result of nitrogen fixation?
17.
What is the number of significant figures in 0.0030050?
18.
Which of the following properties of a substance does NOT represent an intensive physical property?
19.
What is the mass of one molecule of water?
20.
Which of the following quantum number (s) is (are) related to the size and energy of an electron in a hydrogen atom?
21.
An electron has a spin quantum number, s = +1/2 and a magnetic quantum number, m1 = +1. In which of the following orbital will it NOT be present?
22.
Which of the following molecules has a trigonal bi pyramidal structure?
23.
Which of the following represents the general configuration of the transition elements?
24.
The total number of electrons participating in the bond formation of carbonate anion, CO32- in the molecule of carbonic acid are:
25.
Which of the following crystals possess high electrical and thermal conductivities?
26.
What is the valid rate expression for the following reaction? 2NO + 2H2 → N2 + 2H2O
27.
Which of the following statements is TRUE about equilibrium reaction?
28.
Three gases are in equilibrium in a closed chamber sealed with a piston. The following equilibrium is established: 2NH3 (g) ⇋ N2 (g) + 3H2 (g) What will happen if the piston is pushed into the chamber?
29.
Which of the following reactions will produce an akyl carboxylic acid?
30.
Which of the following statements is NOT TRUE?
31.
What is the name of triacylglycerol(triglycerides) that is solid at room temperature?
32.
Which of the following is the most important type of solute-solvent interaction in a solution of n- butanol in water?
33.
What is the product of the hydrolysis of easters in the presence of a mineral acid catalyst?
34.
To which organic functional group does the following molecular representation, i.e, R1R2CHCOH belong? (R1 and R2 represent different alkyl chains)
35.
What is the quantity of water, in mL, required to prepare 0.5 M of HCl from a concentrated solution of 3.5M in 50 mL is?
36.
What is the equivalent weight of HNO3, as an oxidizing agent, in the following balanced reaction? 3Fe2+ + 4H+ + +NO-3 --> 3Fe3+ + NO + 2H2O
37.
Given the following equilibria and equilibrium constant: ( I ) HC2H3O2 + H2O ⇄ H3O+ + C2H3O2- ; Ka = 1.80 X 10-5 ( II ) H2CO3 + H2O ⇄ H3O+ + HCO-3 ; Ka = 4.20 x 10-7 ( III ) NH4+ + H2O ⇄ H3O+ + NH3; Ka = 5.6 x 10-10 ( IV ) HCOOH + H2O ⇄ H3O+ + COOH- ; Ka = 1.80 x 10-4 What is the strength of the acids in DECREASING order?
38.
Given the reaction: H2PO4- + H2O → H3O+ + HPO42- Which of the following represents a conjugate acid base pair?
39.
Which of the following statements is TRUE about colligative properties
40.
What is the pH of 0.005 M solution of Ca(OH)2?
41.
The indicator Bromthymol Blue (HBb) is a weak acid with Ka = 1.0 x 10-7 ionizes as follows: HBb(aq, yellow) ⇌ H+ (aq, colorless) + ln- (aq, blue) Which way will the equilibrium shift when NaOH is added and what will the colour of the NaOH solution be containing this indicator?
42.
How many kilo joules of heat are absorbed when 20 g of NaCl(s) is decomposed in to Na(s) and Cl2(g) at constant pressure according to the following reaction? 2Na(s) + Cl2(g) → 2NaCl(s) ∆H= -821.8kl
43.
In the electroplating of nickel from a solution containing Ni2+ ion, what will be the weight of the metal deposited on the cathode by a current of 8 A flowing for 500 minutes?
44.
A 1M solution of Cu(NO3)2 is placed in a beaker with a strip of Cu metal. A 1M of SnSO4 is placed in a second beaker with a strip of Sn metal. The two beakers are then connected by a salt bridge and the two metal electrodes are connected by wires to a voltmeter. Which of the following electrodes serves as the anode and which electrode gains mass? Given that E0Cu2+/Cu=0.34V and E0Sn2+/Sn = 0.14V
45.
Which of the following metal alloys does NOT contain tin?
46.
What structural feature is usually needed to present in order for an addition polymer to be produced?
47.
What are the raw materials required to synthesize nylon 6, 6, a specific king of nylon?
48.
Which of the following substances are added to natural rubber to toughen it?
49.
What is the quantity of heat required to raise the temperature of 80g of ethanol from 250C to 750C? (specific heat of ethanol = 2.46Jg-1K-1)
50.
Consider the following gaseous reaction at 250C: CH4(g) + 202(g) → CO2(g) + 2H2O(g) ∆H = -802kJ Which energy change would occur if 3.2 moles of CH4 is completely combusted?
51.
What is the number of chloride ions (Cl-) present in 1.0 x 10-5 mol of AlCl3?
52.
Which of the following is the most important ingredients used for production of DAP fertilizer?
53.
Which of the following bio molecules forms a zwitterions at higher or lower PH?
54.
Which of the following form of synthetic rubbers can be vulcanized to greatly enhance its mechanical strength?
55.
What is the range in the number of carbon atom of the monosaccharides that are found in nature?
56.
What are the two principal polysaccharide forms of starch?
57.
What is the Kelvin scale (K) corresponding to the temperature readings when the degree Celsius (0C) is identical to the degree Fahrenheit (0F)?
58.
What is the wavelength associated with an electron of mass, m = 9.11 x 10-28g, travelling at 40% of the velocity of light?
59.
The quantum numbers listed below are meant for four different electrons in an atom:
60.
Which of the following hybrid orbitals is favouring the formation of trigonal bipyramidal?
61.
Which one of the following molecules/molecular ions is paramagnetic according to the molecular orbital theory?
62.
For the reaction: 2A + B → C the following experimental results were obtained: Experiment [A] [B] Rate (mol L-1 S-1) 1 0.50 0.50 0.300 2 0.50 0.25 0.075 3 0.25 0.25 0.075 What is the value of the rate constant?
63.
Increase in temperature of rate of a given reaction is due to the increase in the
64.
If a piece of aluminium (Al) foil measuring 24 cm by 31 cm has a mass of 10.35 g, (density of Al = 2.70 gcm-3). What is the thickness of the foil in millimetres?
65.
What sizes of particles and velocities can one consider quantum effect?
66.
Which of the following molecules has a dipole moment?
67.
The reaction for the formation of nitrosyl chloride 2NO (g) + Cl2(g) ⇌ 2NOCl (g) was studied at 250C. the value of Kp for this reaction at 250C is 1.9 x 103 atm-1. What is the value of K at 250C?
68.
Which of the following reactions will convert carboxylic acids to primary amines?
69.
A solution was prepared by adding 48g of methanol (CH3OH) in to 81g of water (H2O). What is the mole fraction of methanol in this solution?
70.
A solution was prepared by dissolving 3.75 g of pure hydrocarbon in 95.0g of cyclohexane. The boiling point of pure cyclohexane was observed to be 80.700C and that of the solution was 81.450C. What is the approximate molecular weight of the hydrocarbon? (Kb for cyclohexane = 2.790C/m)
71.
A 50mL solution of H2SO4 of 0.205 M is titrated with NaOH solution of unknown concentration. The endpoint against phenolphthalenin indicator was signalled when 41.0ml of NaOH was added. What is the concentration of NaOH solution?
72.
To 0.2 M solution of a weak monoprotic acid, HA, enough quantity of its sodium salt, NaA, was dissolved to give a concentration of 0.2 M of the salt. What will be the acid concentration, [H3O+], in the final solutions? (Ka of HA = 1.80 x 10-5)
73.
Gaseous petrol in a combustion system has done 375kJ of work during its expansion in the piston. Simultaneously, it absorbed 586 kJ of heat from the engine. What is the internal energy change during the process?
74.
Which of the following reactions is expected to have negative value of entropy change (∆S)?
75.
Consider the following unbalanced redox reaction in acidic solution: MnO4- + Fe2+ → Mn2+ + Fe3+ what is the change in oxidation state for both the substances oxidized and reduced, and the coefficients of Fe2+ and Mn2+, respectively after balancing?
76.
How many mL conc. HNO3 and how many mL of water are required to prepare 500mL of 0.1M HNO3 from a conc. 13M HNO3?
77.
What is the pH of an aqueous solution prepared to contain 1.3 x 10-3M sodium nitrite (NaNO2) if the acid dissociation equilibrium constant, Ka for nitrous acid (HNO2) is 5.1 x 10-4? Kw = 1.0 x 10-14
78.
What reactions occur at the anode and cathode when an aqueous solution of Na2SO4 is electrolyzed? E0 red I. S2O82- + 2e- → 2SO42- 2.01V II. O2 + 4H+ + 4e- → 2H2O 1.23V III. 2H2O + 2e- → H2 + 2OH- -0.83V IV. Na+ + e- → Na -2.71V
79.
Which synthetic polymer is produced from caprolactam?
80.
For the following hypothetical equation, in aqueous solution, what is the correct representation of the cell notation? A(s) + B2+(aq) _ A2+(aq) + B(s)
