CHEMISTRY EXAMINATION QUESTIONS FOR SS2 |FIRST TERM EXAMINATION, 2018/2019 SESSION

CHEMISTRY EXAMINATION QUESTIONS|FIRST TERM EXAMINATION, 2018/2019 SESSION

FIRST TERM EXAMINATION, 2018/2019 SESSION 

CLASS: SS 2       SUBJECT:  CHEMISTRY      TIME: 2 HOURS

SECTION A – OBJECTIVES [50MARKS]

Instructions: Answer all questions

1. Reaction represented by the equation is known as Hydrolysis   B. Oxidation  C. Reduction   D. Fermentation

2. The reaction represented by the equation NaOH_(aq)+ HCL_(aq) is a double decomposition reaction  B. Is a neutralization  reaction
3. Is reversible D. Is usually catalyzed
4. Which of the following does NOT affect the rate of a chemical reaction?
5. Concentration of the reactants B. Addition or presence of a catalyst C. size of the reacting particles   D. The enthalpy change for the reaction
6. Given that 32.0g of sulphur contains 6.02 x 10²³ sulphur atoms, how many atoms are there in 2.70g of aluminum? A. 6.02 x 10²³ 3.01 x 10²³  C. 6.02 x 10²²   D. 5.08 x 10²²
7. A salt which has loses mass when exposed to air is A. Hygroscopic
8. Deliquescent C. Efflorescent   D. Fluorescent
9. The following are heavy chemicals EXCEPT A. tetraoxosulphate(vi) acid Caustic Soda   C. Sodium trioxocarbonate(iv)  D. Dyes
10. Which of the following correctly explains why iodine crystals change directly into the gaseous state when heated? A. Iodine crystals sublime Iodine atoms are held together by strong forces  C. Iodine molecules are held together by strong forces  C. Iodine molecules are held together by weak forces  D. Iodine molecules are covalent
11. The major raw material in the plastic  industry is A. Ethanol
12. Sulphur C. Methylethanoate D. Ethene
13. When an element can exist in two or more forms in the same physical state, the element is said to exhibit A. Isotopy Isomerism  C. Allotropy  D. Hygroscopy
14. What is the concentration, in moldm^-2, of a solution containing 0.10g of sodium hydroxide per 50cm³ of solution? A. 0.05 0.1   C. 0.5  D.2
15. The following are s-block elements EXCEPT Lithium    B. Magnesium  C. Aluminum  D. Barium
16. The electronic configurations of two atoms X and Y are as follows;

X: 1S² 2S² 2P⁶ 35¹, Y; 1S²2S² 2P⁶ 3S² 3P⁶ 4S². Which of the statements below is true of the position of X and Y in the periodic table?

1. X belongs to group 1, Y belongs to period 2
2. X belongs to group 1, Y belongs to period 4.
3. X belongs to group 2, Y belongs to period 1
4. X belongs to group 3, Y belongs to period 2
5. The oxidation number of chloride is +1 in A. KClO₃   Cl₂O₇  C. ZnCl₂   D. NaClO
6. Which of the following separation is routinely applied in the petroleum industry A. Filtration Chromatogrphy  C. Evaporation  D. Fractional distillation
7. What does X stand for in the following expression? X = -log₁₀ [H⁺]
8. Enthalpy change, H B. Equilibrium constant, K C. Solubility product   D. Degree of acidity, p^H
9. Which of the following indicates correctly the increasing order of oxidizing power of the halogens? A. F<Cl<Br<I I<Br<Cl<F
10. I<Cl<Br<F D. Br<I<Cl<F
11. Which of the following compounds has the highest ionic character?
12. KCl_(s) B. BeCl_2(s) C. HCl_(g)      D. AlCl_3(s)
13. What is the percentage by mass of copper in copper (i) oxide A. 88.9% 80.0%   C. 66.7%   D. 20.0%
14. A weak acid is one which A. Is not corrosive Is slightly ionized in water   C. Does not produce salts with alkalis   D. Does not conduct an electric current in aqueous solution
15. Alums are classified as A. Simple salts Acid salts  C. Anhydrous salts  D. Basic salts
16. Which of the following oxides is amphoteric? A. Na₂O Fe₂O₃
17. Al₂O₃ D. CaO
18. When an atom gains an electron, it becomes A. Chemically inactive
19. Negatively charged C. Oxidized D. A cation
20. The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by A. Cooling the reaction mixture Using zinc powder instead of zinc granules
21. Using Zinc rod instead of Zinc granules D. carrying out the reaction at a higher pressure

24. What is the role of MnO­₂ in the reaction represented by the following equation? MnO₂ + 4Hcl  Bleaching agent  B. Reducing agent
25. Catalyst D. Oxidizing agent
26. The following are properties of transition metals EXCEPT Variable  oxidation states  B. tendency to form complex ions  C. low melting points  D. Ability  to act as catalyst
27. The major air pollutants that can result from smoky vehicles include I. Acid fumes Hydrogen sulphide  III. Carbon (ii) oxide   IV. Carbon particles  A. I, II, III, IV   B. I, II  only  C. I and IV only  D. II, III, IV only
28. The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as A. Tyndal effect Diffusion  C. Osmosis  D. Brownian movement
29. A given volume of methane diffuses in 20 seconds. How long will it take the same volume of sulphur (iv) oxide to diffuse under the same conditions? 5 seconds    B. 20 seconds  C. 40 seconds  D. 60 seconds
30. These are factors affecting the rate of chemical reactions EXCEPT
31. Surface area B. Catalyst C. Nature of reactants  D. Equilibrium position
32. Factors which can contribute to environmental pollution include Overpopulation  II. Chemical warfare  III. Agricultural activities IV. Industrialization   A. I, II only  B. II, III only  C. III, IV only  D. I, II, III IV
33. Which of the following contains the highest number of electrons in the outermost shell? A. O Ne    C. P   D. K
34. Pauli’s exclusion principle is related to A. Quantum numbers of electrons Reversibility of equilibrium reactions  C. Electronegative values of elements   D. Collision theory of reaction rates
35. Which of the following properties increases dawn a group in the periodic table? A. Atomic radius  Electronegativity   C. Electron affinity
36. Limization energy
37. In the periodic table, elements that lose electrons most readily belong to A. Group 1A   Group IIA  C. Group IIIA  D. Group IIIA
38. The type of chemical bond that exist between potassium and oxygen in potassium oxide is A. Ionic Metallic  C. Covalent   D. Dative
39. What is the value of x in the following equation?

Cr₂    A.1   B.6  C.8  D.12

37. Which of the following procedures is suitable for identifying the food colourng added to a pastry sample? A. carry out some food tests
38. Examine the pastry sample under a microsocope C. Do a chromatogram of the colouring extract D. Determine the molar mass of the colouring
39. Which of the following statement about idea gases is/are correct? I. The cohesive forces between their particles are negligible. II. They have no definite volume, but occupy the volume of their containers They are not compressible  IV. Their particles collide with loss of energy A. I only  B. I and II only  C. I, II and III only  D. I, II, III, IV
40. What is the oxidation number of nitrogen in Al (NO₃)₃? +1   B. +3
41. +5 D. +6
42. What is oxidized in the reaction represented by the following equation? 3Cu+8HNO₃ 3Cu(NO₃)₂  + 2NO + 4H₂O A. Oxygen   Hydrogen
43. Nitrogen D. Copper
44. Which of the following establishments uses the process of fermentation in its operation? A. Fertilizer Textile industry  C. Brewery  D. Soap manufacturing industry
45. The relative molecular mass of an element is NOT a whole number; it can be deduced tat the element is A. naturally radioactive Abundant in nature  C. A transition metal   D. An isotopic mixture
46. Calculate the mass of sodium hydroxide in 5.00dm³ of a 0.125mol dm^-3 Solution A. 0.0156g 0.625g  C. 1.00g  D. 25.0g
47. One of the methods used for combating air pollution is A. Burning of solid waste  Provision of sanitary land fills C. Legislation against  some industrial practices  D. Scavenging of refuse dumps
48. Which of the electrons in the following orbital will experience the gratest nuclear attraction? A. 1s electron of helium    1s electron of potassium C. 2s electron of boron   D. 2s electron of carbon
49. An element Q forms a compound QCl_s. In  which group of periodic table is Q? A. I B. II  V   D. VII
50. Which of the following arrangements is in order of increasing ionization energy? AI, Si, P.S  B. Si, Al,s  P  C. S, P, Si, Al   D. P, Si, S, Al
51. What is the percentage by weight of calcium in CaCoCl₂? 28.0%
52. 31.6% C. 43.8% D. 44.5%
53. A catalyst increases the rate of chemical reaction by A. Decreasing the temperature of the reaction Decreasing  the activation energy of the reaction C. Increasing the surface area of the rectants  D. Decreasing the surface area o the products.
54. Which of the following oxides of Nitrogen has oxidation number of +1 KNO₃   B. N₂O  C. N₂O₂  D. NO

SECTION B – THEORY [80MARKS]

Instruction: This section consist of the parts, answer atleast one (1) question from each part and four (4) questions in all

PART 1

1. The following table gives the atomic numbers of element V, W, X, Y and Z

(a)      Which of the elements

(i) belong(s) to group 1? (ii) is/are noble gas(es)?  (iii) form(s) ionic compounds(s)?

(iv) form(s) an anion?  (v) react(s) with water to liberate hydrogen?

(vi) React(s) with water to form alkaline solution?

b(i)     What is meant by “first ionization solution?

(ii)      List three properties of electrovalent compounds

(iii)     Consider the following pairs of element (I) ₉F and ₁₇Cl;

(iv)     ₁₂M_g and _2-Ca. explain briefly why the elements in each pair have similar chemical properties.

2a(i)   What is the common name given to the group VII elements?

(ii)      Name the hydrides of the first two elements in group VII

(iii)     State THREE  chemical properties of group VII elements

1. Copy and complete the following table

1. Define each of the following (i) Ion (ii) Isotopes  (iii) periodic law
2. Define each of the following and state their variations in the period table

(i) atomic radius  (ii) electron affinity  (iii) electronegativity

PART II

3a.     Write short notes on the following reaction giving examples in

• Reversible reaction (ii) Double Decomposition reaction

(iii) Thermal dissociation reaction

1. Define accurately the term catalyst and give FIVE characteristics of a catalyst
2. Differentiate between homogenous and heterogeneous catalysis
3. Show that the following reactions are oxidation – reducing reactions, indicating with reasons the oxidizing and reducing agents
4. i) 2H₂S_(g) + SO_2(g)   2H₂O_(l)  + 3S_(s)     (ii) 2FeCl_2(g) + Cl_2(g)   2FeCl_3(aq)

4a.     Define the following, giving an example of a compound in each case

(i)  Oxidizing agent  (ii) Reducing agent

1. When hydrogen sulphide is burnt in oxygen to form sulphur(iv) oxide and water;
2. Write a balanced equation for the combustion
3. How does the oxidation  number of sulphur change?
4. Balance the following Redox reaction in acidic medium using the half – reaction method

MnO₄ + SO₂   Mn²⁺ + S

READ ALSO:Chemistry Examination Question for Senior Secondary School (SS1)