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CHEMISTRY PAST QUESTION

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SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS)

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Category: CHEMISTRY PAST QUESTIONS

What is the shape of a molecule of CCI4?

2 / 80

Category: CHEMISTRY PAST QUESTIONS

A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?

3 / 80

Category: CHEMISTRY PAST QUESTIONS

Dehydration of ethanol produces

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Category: CHEMISTRY PAST QUESTIONS

If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly

5 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following increases as boiling water changes to steam?

6 / 80

Category: CHEMISTRY PAST QUESTIONS

A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?

7 / 80

Category: CHEMISTRY PAST QUESTIONS

What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3?

8 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following properties increases down a group in the Periodic Table?

9 / 80

Category: CHEMISTRY PAST QUESTIONS

A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by

10 / 80

Category: CHEMISTRY PAST QUESTIONS

One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]

11 / 80

Category: CHEMISTRY PAST QUESTIONS

How many electrons are removed from Cr2- when it is oxidized to CrO42-?

12 / 80

Category: CHEMISTRY PAST QUESTIONS

If the solubility of KHCO3 is 0.40 mole dm-3

13 / 80

Category: CHEMISTRY PAST QUESTIONS

What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O

14 / 80

Category: CHEMISTRY PAST QUESTIONS

Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore

15 / 80

Category: CHEMISTRY PAST QUESTIONS

Helium is preferred to hydrogen in filling balloons because hydrogen

16 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following compounds dissolves in water to form a solution with pH below 7?

17 / 80

Category: CHEMISTRY PAST QUESTIONS

Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as

18 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes?

19 / 80

Category: CHEMISTRY PAST QUESTIONS

Chemical equilibrium is attained when

20 / 80

Category: CHEMISTRY PAST QUESTIONS

When alkanols react with sodium, the ga evolved is

21 / 80

Category: CHEMISTRY PAST QUESTIONS

A finely divided from of a metal burns more readily in air than the rod from because the rod has

22 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following non-metals reacts most readily with metals?

23 / 80

Category: CHEMISTRY PAST QUESTIONS

Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of

24 / 80

Category: CHEMISTRY PAST QUESTIONS

A radioactive solid is best stored

25 / 80

Category: CHEMISTRY PAST QUESTIONS

0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI

26 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following pairs of reagents recat to produce hydrogen?

27 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following can undergo both addition reactions and substitution reactions?

28 / 80

Category: CHEMISTRY PAST QUESTIONS

Gas molecules are said to be perfectly elastic because

29 / 80

Category: CHEMISTRY PAST QUESTIONS

The spontaneity of a chemical reaction is determined by the change in the

30 / 80

Category: CHEMISTRY PAST QUESTIONS

Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of

31 / 80

Category: CHEMISTRY PAST QUESTIONS

In the Periodic Table, the elements that loss electrons most readily belong to

32 / 80

Category: CHEMISTRY PAST QUESTIONS

The liquid product of the destructive distillation of coal is

33 / 80

Category: CHEMISTRY PAST QUESTIONS

It can be concluded that gastric juice

34 / 80

Category: CHEMISTRY PAST QUESTIONS

Petrol consists mainly of

35 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?

36 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following statements about ideal gases is/are correct?

I. The cohesive forces between their particles are negligible

ll. The have no definite volume but occupy the volume of their containers

III. They are not compressible

IV. Their particles collide with loss of energy

37 / 80

Category: CHEMISTRY PAST QUESTIONS

What is responsible for metallic bonding?

38 / 80

Category: CHEMISTRY PAST QUESTIONS

Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?

39 / 80

Category: CHEMISTRY PAST QUESTIONS

Calcium atom ionizes by

40 / 80

Category: CHEMISTRY PAST QUESTIONS

What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O

41 / 80

Category: CHEMISTRY PAST QUESTIONS

What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]

42 / 80

Category: CHEMISTRY PAST QUESTIONS

Rusting of iron is an example of

43 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following will displace copper from a solution of copper (ll) salt?

44 / 80

Category: CHEMISTRY PAST QUESTIONS

Pauli Exclusion Principle is related to

45 / 80

Category: CHEMISTRY PAST QUESTIONS

Aluminium is extracted from

46 / 80

Category: CHEMISTRY PAST QUESTIONS

The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?

47 / 80

Category: CHEMISTRY PAST QUESTIONS

Chlorine atom forms CI by

48 / 80

Category: CHEMISTRY PAST QUESTIONS

What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]

49 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?

50 / 80

Category: CHEMISTRY PAST QUESTIONS

What is the oxidation number of nitrogen in AI(NO3)3?

51 / 80

Category: CHEMISTRY PAST QUESTIONS

Substances which absorb water from the atmosphere without dissolving in it are said to be

52 / 80

Category: CHEMISTRY PAST QUESTIONS

Pipe-borne water is usually chlorinated in order to

53 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following lowers the activation energy of a chemical reaction?

54 / 80

Category: CHEMISTRY PAST QUESTIONS

The type of chemical bond that exists between potassium and oxygen in potassium oxide is

55 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following movements can be described as random motion?

56 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following compounds dissolves in water to give an alkaline solution?

57 / 80

Category: CHEMISTRY PAST QUESTIONS

The crystal layers in graphite are held together by

58 / 80

Category: CHEMISTRY PAST QUESTIONS

30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction

59 / 80

Category: CHEMISTRY PAST QUESTIONS

Elactrostatic force of attraction between sodium ion and halide ion is greatest in

60 / 80

Category: CHEMISTRY PAST QUESTIONS

Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that

61 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following methods is suitable for the preparation of an insoluble salt?

62 / 80

Category: CHEMISTRY PAST QUESTIONS

What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1

63 / 80

Category: CHEMISTRY PAST QUESTIONS

Equal volumes of CO2 cnd CO at s.t.p have the same

64 / 80

Category: CHEMISTRY PAST QUESTIONS

What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)

65 / 80

Category: CHEMISTRY PAST QUESTIONS

Elements which belong to the same group in the Periodic Table are characterized by

66 / 80

Category: CHEMISTRY PAST QUESTIONS

Metals are said to be malleable because they

67 / 80

Category: CHEMISTRY PAST QUESTIONS

An exothermic reaction is one which involves

68 / 80

Category: CHEMISTRY PAST QUESTIONS

What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2(l)

69 / 80

Category: CHEMISTRY PAST QUESTIONS

The property of calcium chloride which makes it useful as a drying agent is that it is

70 / 80

Category: CHEMISTRY PAST QUESTIONS

The presence of unpaired electrons in an atom of a transition metal gives rise to

71 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following contains co-ordinate covalent bond?

72 / 80

Category: CHEMISTRY PAST QUESTIONS

What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1

73 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?

74 / 80

Category: CHEMISTRY PAST QUESTIONS

Electrovalent compounds are characterized by

75 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following features of a human skeleton can be determined by carbon-dating?

76 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following is not correct about oxidation number convention? The oxidation number of a/an

77 / 80

Category: CHEMISTRY PAST QUESTIONS

A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of

78 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following substances decomposes when an electric current is passed through it?

79 / 80

Category: CHEMISTRY PAST QUESTIONS

The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is

80 / 80

Category: CHEMISTRY PAST QUESTIONS

Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?

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