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SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS)

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CHEMISTRY PAST QUESTIONS

Attempt all 60 questions that are selected from the Chemistry question bank. Use the NEXT, PREV, CLEAR and FINISH buttons to navigate around the CBT.

You have 1 hour to answer all 60 questions.

 

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1 / 60

Category: CHEMISTRY PAST QUESTIONS

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

2 / 60

Category: CHEMISTRY PAST QUESTIONS

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

3 / 60

Category: CHEMISTRY PAST QUESTIONS

Dehydration of ethanol produces

4 / 60

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]

5 / 60

Category: CHEMISTRY PAST QUESTIONS

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

6 / 60

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

7 / 60

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?

8 / 60

Category: CHEMISTRY PAST QUESTIONS

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

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Category: CHEMISTRY PAST QUESTIONS

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

10 / 60

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)

11 / 60

Category: CHEMISTRY PAST QUESTIONS

Pipe-borne water is usually chlorinated in order to

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Category: CHEMISTRY PAST QUESTIONS

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

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Category: CHEMISTRY PAST QUESTIONS

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

14 / 60

Category: CHEMISTRY PAST QUESTIONS

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

15 / 60

Category: CHEMISTRY PAST QUESTIONS

Calcium atom ionizes by

16 / 60

Category: CHEMISTRY PAST QUESTIONS

Rusting of iron is an example of

17 / 60

Category: CHEMISTRY PAST QUESTIONS

The liquid product of the destructive distillation of coal is

18 / 60

Category: CHEMISTRY PAST QUESTIONS

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

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Category: CHEMISTRY PAST QUESTIONS

What is responsible for metallic bonding?

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Category: CHEMISTRY PAST QUESTIONS

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

21 / 60

Category: CHEMISTRY PAST QUESTIONS

An exothermic reaction is one which involves

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Category: CHEMISTRY PAST QUESTIONS

Gas molecules are said to be perfectly elastic because

24 / 60

Category: CHEMISTRY PAST QUESTIONS

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

25 / 60

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?

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Category: CHEMISTRY PAST QUESTIONS

What is the shape of a molecule of CCI4?

27 / 60

Category: CHEMISTRY PAST QUESTIONS

Chlorine atom forms CI by

28 / 60

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

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Category: CHEMISTRY PAST QUESTIONS

Electrovalent compounds are characterized by

30 / 60

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]

31 / 60

Category: CHEMISTRY PAST QUESTIONS

It can be concluded that gastric juice

32 / 60

Category: CHEMISTRY PAST QUESTIONS

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

33 / 60

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

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Category: CHEMISTRY PAST QUESTIONS

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

35 / 60

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?

36 / 60

Category: CHEMISTRY PAST QUESTIONS

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

37 / 60

Category: CHEMISTRY PAST QUESTIONS

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

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Category: CHEMISTRY PAST QUESTIONS

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

39 / 60

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

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Category: CHEMISTRY PAST QUESTIONS

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

41 / 60

Category: CHEMISTRY PAST QUESTIONS

Helium is preferred to hydrogen in filling balloons because hydrogen

42 / 60

Category: CHEMISTRY PAST QUESTIONS

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

44 / 60

Category: CHEMISTRY PAST QUESTIONS

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

45 / 60

Category: CHEMISTRY PAST QUESTIONS

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

46 / 60

Category: CHEMISTRY PAST QUESTIONS

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

47 / 60

Category: CHEMISTRY PAST QUESTIONS

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

48 / 60

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

49 / 60

Category: CHEMISTRY PAST QUESTIONS

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

50 / 60

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

51 / 60

Category: CHEMISTRY PAST QUESTIONS

Metals are said to be malleable because they

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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

53 / 60

Category: CHEMISTRY PAST QUESTIONS

When alkanols react with sodium, the ga evolved is

54 / 60

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

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Category: CHEMISTRY PAST QUESTIONS

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

56 / 60

Category: CHEMISTRY PAST QUESTIONS

Chemical equilibrium is attained when

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Category: CHEMISTRY PAST QUESTIONS

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

58 / 60

Category: CHEMISTRY PAST QUESTIONS

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

59 / 60

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]

60 / 60

Category: CHEMISTRY PAST QUESTIONS

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

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