PES SS1 CHEMISTRY

1. ____occurs naturally as graphite

A) Carbon
B) Copper
C) Calcium
D) Aluminium
E) Colgate

2. There are _____ allotropes of carbon

A) 3
B) 4
C) 2
D) 5
E) 6

3. The existence in the same physical state of two or more structural forms of the same element is known as ____

A) isotopy
B) allotropy
C) eclipse
D) ionization
E) hybridization

4. Amorphous carbon are also known as___ carbon

A) non-crystalline
B) solid
C) crystalline
D) amorphous
E) non-amorphous

5. Example of a crystalline carbon is____

A) sugar charcoal
B) wood charcoal
C) diamond
D) coal
E) animal charcoal

6. _____ is a good conductor of heat and electricity

A) non of the above
B) Diamond
C) Coke
D) Graphite
E) Oxygen

7. ____ have high resistant to temperature and chemical attack

A) Coal tar
B) Wood charcoal
C) Graphite
D) Diamond
E) Charcoal

8. Which of these exist as black, slippery crystal

A) diamond
B) graphite
C) charcoal
D) all of the above
E) wood

9. Which allotrope of carbon can be used in the manufacture of lead pencils

A) coal
B) graphite
C) diamond
D) wood
E) coke

10. ___ is used to sharpen very hard tool

A) Diamond
B) Copper
C) Sharpener
D) Iron
E) Graphite

11. Graphite is ____ in shape

A) nonagonal
B) pentagonal
C) butagonal
D) octahedral
E) hexagonal

12. Diamond is _____in shape

A) all of the above
B) decahedral
C) hexahedral
D) heptahedral
E) octahedral

13. What is the colour of diamond

A) blue
B) colourless
C) pink
D) white
E) purple

14. The carbon molecules in diamond are closely packed and held by strong _____bond

A) ionic
B) electrovalent
C) dative
D) covalent
E) metallic

15. Which of the allotrope of carbon can be used as jewellery

A) none of the above
B) diamond
C) coal
D) wood
E) graphite

16. What is the impurity that is present in wood charcoal

A) calcium tetraoxophosphate (v)
B) pottasium
C) hydrogen
D) sulphur
E) phosphorus

17. In the periodic table, groups are numbered from____to___

A) 0-7
B) 0-8
C) 1-8
D) 6-7
E) 1-9

18. Group are found in the ____ column

A) apex
B) horizontal
C) upside down
D) lateral
E) vertical

19. Periods are found in the ____ column

A) horizontal
B) lateral
C) vertical
D) backward
E) apex

20. Periods are numbered from ______ to ____

A) 1-5
B) 1-8
C) 1-7
D) 0-7
E) 0-8

21. In between Group 2and 3 lie ___ element

A) reversible
B) gone
C) reversal
D) transition
E) upcoming

22. Which group is referred to as noble gases

A) group 2
B) group 0
C) group 4
D) group 3
E) group1

23. which groups are known as halogens

A) group 8
B) group 7
C) group 5
D) group 9
E) group 6

24. Calcium is found in what group of the periodic table

A) group 3
B) group 2
C) group 0
D) group 5
E) group10

25. Group____ are referred to as alkaline earth metal

A) 2
B) 5
C) 4
D) 6
E) 3

26. Calculate the molar mass of Potassium chloride(k=39, Cl=35.5)

A) 58.5gmol
B) 24gmol
C) 74gmol
D) 74.5gmol
E) 47gmol

27. What is the most active constituent of air?

A) Carbon(iv)oxide
B) Nitrogen
C) Oxygen
D) Noble vapour
E) Water vapour

28. ____ is the mixture of gases in the atmosphere

A) Breeze
B) Air
C) Gas
D) Whirlwind
E) Smoke

29. What is the percentage of nitrogen in air?

A) 0.03%
B) 1%
C) variable
D) 78%
E) 21%

30. All of these are evidence that air is a mixture except

A) The composition of air cannot be represented by a chemical formula as in the case of a compound
B) The constituents of air still retain their individual properties
C) If the appropriate proportions of each of the different consituents of air are mixed together under ordinary conditions, there will be no evidence of any chemical combination such as heat production or volume change
D) The constituent of air can be separated easily by physical methods
E) Air is solid at room temperature

31. The corrosion of iron is known as _____

A) Method
B) Flaming
C) Rusting
D) Melting
E) Corrosion

32. Corrosion of metals results from the combined action of atmospheric ___ and____

A) oxygen and salt
B) oxygen and salt
C) oxygen and water
D) chlorine and water
E) sulphur and air

33. Ways of preventing iron from rusting include all except____

A) electroplating
B) drying
C) greasing and oiling
D) painting
E) galvanising

34. _____is a process of preventing iron from rusting by protecting it with other metals like copper, tin, gold and silver

A) Painting
B) Greasing
C) Electroplating
D) Oiling
E) Galvanising

35. The application of paint to iron to prevent it from rusting is known as _____

A) platinum
B) plating
C) painting
D) oiling
E) enamel

36. Is air a mixture?

A) all of the above
B) yes
C) i do not know
D) maybe
E) no

37. ____ alters the rate of a chemical reaction

A) Chemical
B) Spirit
C) Solvent
D) Catalyst
E) Reaction

38. The characteristics of catalyst include all except one

A) It is specific in action
B) It will affect the rate of a reaction even though it is present in a very small amount
C) It has no effect on the equilibrum position of a reversible reaction
D) It cannot start a reaction
E) A catalyst can affect the types of products formed in a reaction

39. _____ is the sum of the powers of the concentration of the reactants which appear in the rate of reaction

A) Order the reaction
B) State of reactant
C) Order of reaction
D) Order of reactant
E) Condition of reaction

40. There are how many categories of order of reaction?

A) 0
B) 9
C) 3
D) 1
E) 2

41. If the rate depends on the square of the concentration of A, that is (A)2, then the reaction is _____order

A) zero
B) nine
C) one
D) second
E) third

42. If the rate of reaction is proportional to the concentration of a reactant, A, then the reaction is ___ order

A) third
B) second
C) nine
D) zero
E) first

43. If the concentration of the reactant does not affect the rate of reaction, then it is ____order

A) one
B) third
C) second
D) nine
E) zero

44. All except one are factors affecting the rate of chemical reactions

A) nature of the reactants
B) presence of catalyst
C) presence of light
D) surface area of the reactants
E) colour of the reactants

45. _____ states that for a chemical reaction to occur, the reacting particles must collide with one another

A) Thermodynamics theory
B) Coiling theory
C) Cooking theory
D) Collision theory
E) Colliding theory

46. _____ leads to the release of heat to the environment

A) Catalase reaction
B) all of the above
C) Exothermic reaction
D) reversible reaction
E) Endothermic reaction

47. In endothermic reaction____ is absorbed

A) heat
B) cold
C) all of the above
D) smoke
E) air

48. ____ is the science that is concerned with the composition and the structure of matter and with the forces that hold the structures together

A) Biology
B) Physics
C) Chemistry
D) Economics
E) Yoruba

49. Anything that has mass and occupies space is called ____

A) Weight
B) Mole
C) Mass
D) Matter
E) Heavy object

50. ____ is a measure of the quantity of matter

A) Weight
B) Matter
C) Molecule
D) Science
E) Mass

51. Matter exist in how many state?

A) 3
B) 5
C) 1
D) 2
E) 7

52. Ammonia is written as____

A) NH2
B) NH4
C) None of the above
D) NH
E) NH3

53. _____ is the smallest particle of a substance that is capable of independence existence and still retains the chemical properties of that substance

A) Matter
B) Atom
C) All of the above
D) Molecule
E) Mass

54. What is the mass number of an element with atomic number 6 and 8 number of neutron

A) 16
B) 13
C) 12
D) 15
E) 14

55. What is the atomic number of an element with mass number of 25 and neutron number 13

A) 13
B) 15
C) 12
D) 14
E) 16

56. What is the number of neutron of an element with mass number of 16 and proton number of 8

A) 8
B) 9
C) 12
D) 10
E) 11

57. How many moles of electrons is required to deposit 5.6g of iron from a solution of iron(ll) tetraoxosulphate(vi)? (Fe=56, S=32, O=16)

A) 1.00moles
B) 0.10moles
C) 0.20moles
D) 2.00m0les
E) 0.04moles

58. Nitrogen is number what in the periodic table?

A) 7
B) 0
C) 9
D) 4
E) 6

59. The symbol of silver is written as

A) Al
B) Pb
C) Ag
D) S
E) Si

60. Potassium is written as

A) K
B) Pb
C) Po
D) P
E) None of the above

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