CHEMISTRY EXAMINATION QUESTIONS|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
  1. The reaction represented by the equation NaOH(aq)+ HCL(aq) is a double decomposition reaction  B. Is a neutralization  reaction
  2. Is reversible D. Is usually catalyzed
  3. Which of the following does NOT affect the rate of a chemical reaction?
  4. Concentration of the reactants B. Addition or presence of a catalyst C. size of the reacting particles   D. The enthalpy change for the reaction
  5. 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
  6. A salt which has loses mass when exposed to air is A. Hygroscopic
  7. Deliquescent C. Efflorescent   D. Fluorescent
  8. The following are heavy chemicals EXCEPT A. tetraoxosulphate(vi) acid Caustic Soda   C. Sodium trioxocarbonate(iv)  D. Dyes
  9. 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
  10. The major raw material in the plastic  industry is A. Ethanol
  11. Sulphur C. Methylethanoate D. Ethene
  12. 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
  13. 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
  14. The following are s-block elements EXCEPT Lithium    B. Magnesium  C. Aluminum  D. Barium
  15. 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?

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  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, pH
  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. BeCl2(s) C. HCl(g)      D. AlCl3(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

 

  1. What is the role of MnO­2 in the reaction represented by the following equation? MnO2 + 4Hcl  Bleaching agent  B. Reducing agent
  2. Catalyst D. Oxidizing agent
  3. 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
  4. 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
  5. 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
  6. 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
  7. These are factors affecting the rate of chemical reactions EXCEPT
  8. Surface area B. Catalyst C. Nature of reactants  D. Equilibrium position
  9. 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
  10. Which of the following contains the highest number of electrons in the outermost shell? A. O Ne    C. P   D. K
  11. 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
  12. Which of the following properties increases dawn a group in the periodic table? A. Atomic radius  Electronegativity   C. Electron affinity
  13. Limization energy
  14. In the periodic table, elements that lose electrons most readily belong to A. Group 1A   Group IIA  C. Group IIIA  D. Group IIIA
  15. The type of chemical bond that exist between potassium and oxygen in potassium oxide is A. Ionic Metallic  C. Covalent   D. Dative
  16. What is the value of x in the following equation?

Cr2    A.1   B.6  C.8  D.12

  1. Which of the following procedures is suitable for identifying the food colourng added to a pastry sample? A. carry out some food tests
  2. Examine the pastry sample under a microsocope C. Do a chromatogram of the colouring extract D. Determine the molar mass of the colouring
  3. 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
  4. What is the oxidation number of nitrogen in Al (NO3)3? +1   B. +3
  5. +5 D. +6
  6. What is oxidized in the reaction represented by the following equation? 3Cu+8HNO3 3Cu(NO3)2  + 2NO + 4H2O A. Oxygen   Hydrogen
  7. Nitrogen D. Copper
  8. Which of the following establishments uses the process of fermentation in its operation? A. Fertilizer Textile industry  C. Brewery  D. Soap manufacturing industry
  9. 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
  10. 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
  11. 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
  12. 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
  13. An element Q forms a compound QCls. In  which group of periodic table is Q? A. I B. II  V   D. VII
  14. 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
  15. What is the percentage by weight of calcium in CaCoCl2? 28.0%
  16. 31.6% C. 43.8% D. 44.5%
  17. 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.
  18. 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
Element VWXYZ
Atomic  number1116181924

 

(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)     12Mg 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

Particles Number of neutronNumber of electrons Number of protons Mass number
W2+1224
X2-816
Y1327
Z1211

 

  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) + SO2(g)   2H2O(l)  + 3S(s)     (ii) 2FeCl2(g) + Cl2(g)   2FeCl3(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



 

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