CHEMISTRY FIRST TERM EXAMINATION SS 1

CHEMISTRY EXAMINATION PAPER

CLASS: S.S.S 1
DURATION: 2 HOURS

OBJECTIVE QUESTIONS

1. Which of the following substances is a covalent compound?
   a) Sodium chloride
   b) Magnesium sulphide
   c) Hydrogen chloride
   d) Potassium nitrate
2. The components of universal indicator solution can best be separated by:
   a) Chromatography
   b) Titration
   c) Evaporation
   d) Fractional distillation
3. The mass of an element is 27, and its atomic number is 13. What is the composition of the nucleus of its atom?
   a) 13 neutrons and 14 protons
   b) 13 neutrons and 14 protons
   c) 13 protons and 14 neutrons
   d) 13 electrons and 14 neutrons
4. How many unpaired electrons are in the p-orbital of a fluorine atom?
   a) 1
   b) 2
   c) 3
   d) 0
5. Two elements X and Y combine to form a formula X2Y3. Which of the following representations would fit the configurations of X and Y?
   

   X	Y
   2,2	2,3
   2,6	2,5
   2,8,2	2,8,3
   2,8,3	2,6

6. Element X with electronic configuration 2,8,2 and element Y with electronic configuration 2,8,7 are likely to combine by:
   a) Metallic bonding
   b) Covalent bonding
   c) Electrovalent bonding
   d) Dative bonding
7. Carbon is often deposited in the exhaust pipe of cars because of the:
   a) Presence of carbon in petrol
   b) Dehydrogenation of petrol
   c) Incomplete combustion of petrol
   d) Presence of additives in petrol
8. The following are heavy chemicals except:
   a) Tetraoxosulphate (VI) acid
   b) Caustic soda
   c) Sodium trioxocarbonate (VI)
   d) Ethane
9. Octane numbers are highest in petrol containing a high proportion of:
   a) Heptane
   b) Octane
   c) 2-Methylpentane
   d) 2,2,4-Trimethylpentane
10. When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as:
    a) Polymerization
    b) Refining
    c) Hydrogenation
    d) Fractional distillation
11. Which of the following statements best explains cracking? It is a process:
    a) In which alkene adds on itself repeatedly to form long chain polymer
    b) In which large hydrocarbon molecules are broken into smaller units
    c) In which carbon results in a zig-zag arrangement
    d) In which aromatic hydrocarbons are produced
12. What are the values of x, y, and z respectively in the following equation?
    MnO2(s) + xHCl(aq) → MnCl2(aq) + yH2(l) + zCl2(g)
    a) 4,1,2
    b) 1,2,1
    c) 2,1,2
    d) 4,2,1
13. Boyle’s law can be expressed mathematically as:
    a) V ∝ 1/p
    b) V1/T1 = V2/T2
    c) V ∝ T(P constant)
    d) P ∝ V(T constant)
    e) P ∝ T
14. Which of the following statements explains why tetraoxosulphate (VI) acid is regarded as a strong acid?
    a) It is dibasic
    b) It is concentrated
    c) The acid is completely ionized in aqueous solution
    d) The acid is corrosive
15. The number of replaceable hydrogen atoms in one molecule of an acid indicates its:
    a) Basicity
    b) Alkalinity
    c) Acidity
    d) Reactivity
16. Which of the following is/are characteristic properties of acids? They:
    i) Form hydroxonium ions in water
    ii) Liberate carbon (IV) oxide from trioxocarbonate (IV) salts
    iii) Turn blue litmus paper red
    iv) Have a soapy feel
    a) iv only
    b) i and ii
    c) iii and iv
    d) i, ii, and iii
17. The following acids are monobasic except:
    a) Trioxonitrate (V) acid
    b) Hydrochloric acid
    c) Ethanoic acid
    d) Tetraoxosulphate (VI) acid
18. An acid is a substance which, in the presence of water, produces:
    a) Salts
    b) Oxygen
    c) Effervescence
    d) Hydroxonium ions
19. Which of the following is an acid salt?
    a) (NH4)2CO3
    b) CH3COONa
    c) KHSO4
    d) MgSO4
20. The general methods of preparing salts include:
    i) Neutralization
    ii) Precipitation
    iii) Double decomposition
    iv) Action of an acid on a metal
    a) iv only
    b) i and ii
    c) iii and iv
    d) i, ii, iii, and iv
21. Alums are classified as:
    a) Basic salts
    b) Acid salts
    c) Anhydrous salts
    d) Double salts
22. The following salts will produce gas on reacting with hydrochloric acid except:
    a) CuSO4
    b) CaCO3
    c) FeS
    d) K2CO3
23. Which of the following methods is good for the preparation of an insoluble salt?
    a) Action of an acid on a metal
    b) Double decomposition
    c) Neutralization
    d) Action of an acid on an oxide
24. Which of the following conclusions about a solution of pH 4 is correct?
    a) It contains more OH- than H3O+
    b) Its pOH value will be 10
    c) It is more acidic than a solution of pH 2
    d) Its hydrogen ion concentration is 4.0 x 10^-2
25. The Acheson process is a process of producing:
    a) Graphite from coke at high temperature
    b) Coke using graphite at high temperature
    c) Anthracite from carbon
    d) Wood-charcoal from coal
26. One of these is not a reaction of charcoal:
    a) C + O2 → CO2
    b) CO2 + C → 2CO
    c) 2CO + O2 → 2CO2
    d) CO2 + 2CO → 2CO
27. Kipp’s apparatus is an instrument for preparing an intermittent supply of gases by reacting:
    a) Liquid with gas
    b) Liquid with solid
    c) Solid with gas
    d) Liquid with liquid
28. The gas which dissolves in ammoniacal copper (I) chloride but is insoluble in water is:
    a) NH3
    b) CO
    c) N2O
    d) CO2
29. Fine chemicals have the following characteristics except:
    a) They are chemically pure
    b) They are produced by batch process
    c) They are produced in large quantity because of high applicability
    d) They are produced in small quantity because of limited applicability
30. The exceptionally large number of carbon compounds is essentially due to the ability of:
    a) Carbon to catenate liberally
    b) Various groups to catenate
    c) Nitrogen, hydrogen, phosphorus, and the halogens to catenate with themselves
    d) Hydrocarbons to dominate other groups
31. Universal indicator is added to a colorless solution and turns dark blue. What does this tell you?
    a) It is an acid
    b) It is neutral
    c) It is an alkali
32. Which ion is present in all acid solutions?
    a) Hydrogen ion, H+
    b) Hydroxide ion, OH-
    c) Hydride ion, H-
33. What name is given to a base that dissolves in water?
    a) Amphoteric
    b) An alkali
    c) A salt
34. Which ionic equation takes place in an acid-alkali neutralization reaction?
    a) H+ + OH- → H2O
    b) HCl → H+ + Cl-
    c) NH3 + H2O → NH4+ + OH-
35. Which of the following could be used to neutralize acidic soil?
    a) Sodium chloride
    b) Calcium oxide
    c) Potassium hydroxide
36. In the electrolysis of sodium chloride solution, what is the product formed at the anode?
    a) Chlorine
    b) Sodium
    c) Hydrogen
37. Which of the following would react fastest with acids?
    a) Iron fillings
    b) Iron nails
    c) Iron wool
38. A solution which turns blue litmus red and does not form a precipitate with silver nitrate is:
    a) HCl
    b) H2SO4
    c) CH3COOH
39. A salt obtained from a strong acid and a weak base is:
    a) Neutral salt
    b) Acidic salt
    c) Basic salt
40. The atomic number of an element is 17. The formula of its chloride is:
    a) XCl
    b) XCl2
    c) XCl3

ANSWERS

1. c
2. a
3. c
4. a
5. b
6. c
7. c
8. d
9. d
10. d
11. b
12. a
13. a
14. c
15. a
16. b
17. d
18. d
19. c
20. d
21. d
22. a
23. b
24. b
25. a
26. d
27. b
28. d
29. c
30. a
31. c
32. a
33. b
34. a
35. b
36. a
37. c
38. c
39. b
40. b