Download Now! National Business and Technical Examination Board NABTEB Chemistry Past Questions and Answers (Objective and Essay)
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Chemistry Section A – Objective
Chemistry Section B – Essay
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CHEMISTRY
PAPER I (OBJECTIVE AND ESSAY)
(150 Marks)
PAPER CODE:005-1
Time: 2 hours 30 minutes
INSTRUCTIONS:
This paper consists of two sections: A and B. Section A is Objective and Section B is Essay.
Section A comprises 50 Objective questions which should be answered by all candidates in 50 Minutes;
Section B consists of five Essay questions out of which candidates are expectet to answer four in 1 Hour 40 Minutes.
Table of Contents
NBC/NTC Chemistry Objective Questions
SECTION A OBJECTIVE
Time: 50 Minutes
(50 Marks)
1.Two miscible liquids A (BP SSC) and B(BP 38°C) are together in a container, the separation technique to be employed is
A. distillation.
B. evaporation.
C. fractional distillation.
D. the use of separating funnel.
2. The sum of protons and neutrons of an atom is known as
A. relative atomic mass.
B. mass number.
C. atomic number.
D. isotope number.
3. The relative atomic masses of some elements are not whole number. This is due to
A. isotopy.
B. allotropy.
C. isomerism.
D. polymerization.
4. The following are chemical changes except the
A. decay of organic matter.
B. heating of iodine crystals.
C. burning of wood.
D. rusting of iron.
5. If the atomic numbers of elements X and Y are 12 and 17, then the formula of the compound they form is
A. XY.
B. X2Y.
C. XY2.
D. X2Y3
6. The empirical formula of a hydrocarbon containing 0.12 mole of carbon and 0.36 mole of hydrogen is
A. CHa.
B CH3.
C C2H2.
D. C2H4
7. Which of the following laws is obeyed when 1 volume of hydrogen reads with 1 volume of chlorine to forni 2 volumes of hydrogen chloride?
A. Law of reciprocal proportions
B. Boyle’s laws
C Charle’s law
D. Gay lussac’s law
8. On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
A. black.
B. blue.
C. green.
D. yellow.
9.
| Oxide Solution | PH Value |
| M | 3 |
| N | 6 |
| O | 7 |
| P | 9 |
The PH values of the solutions resulting from the dissolution of the oxides of element M.N.O and P in water are as indicated in the table above. Which of the elements is likely to be a metal?
A. M
B. N
C. 0
D. P
10. The number of hydrogen ions in 1.0dm3 of a 0.25 moledm3 tetraoxosulphate (VI) acid solution is [Avogadro’s constant = 6.0x 1023]
A. 1.45 x10 23
B. 1.50 x10 23
C. 3.00 x10 23
D. 3.15 x10 23
11. The products of electrolysis of dilute sodium chloride solution with platinum electrodes are
A. hydrogen and oxygen.
B. oxygen and chlorine.
C. chlorine and sodium amalgam.
D. sodium, hydrogen and water.
12 .In modem times, helium has gradually replaced hydrogen as gas in balloons, this is because hydrogen
A. is expensive.
B. is highly inflammable.
C. explodes in air.
D. is a heavier gas.
13. The following compounds are hygroscopic except
A. copper (II) oxide.
B. iron (II) chloride.
C quicklime.
D. sodium trioxonitrate (V).
14. In the reaction represented by the following equation; SO2 is acting as a
2H2S(g) + SO2(g) –> 2H2O(l) + 3S(s)
A. reducing agent.
B oxidizing agent.
C bleaching agent.
D. precipitating agent.
15. Cr2O7-2 + 6Fe2+ + 14H+ –> Cr3+ + 6Fe3+ + 7H2O
In the above equation, the oxidation number of chromium changes from
A. +7 to +3
B +6 to +3
C. -6 to +3
D. -2 to +6
16. What amount of copper will be deposited if a current of 10A was passed through a solution (II) salt for 965 seconds? [IF = 96500C]
A. 0.005 mole
B. 0.025 mole
C. 0.050 mole
D 1.000 mole
17. The role of limestone in the extraction of iron is to
A. decompose the iron ore.
B. oxidise red hot coke to carbon (IV) oxide.
C. reduce carbon (IV) oxide.
D. remove the silicate impurities.
18. Glucose can be obtained from starch by
A. dehydration.
B. hydrogenation.
C. dissociation.
D. hydrolysis.
19. The solvent commonly used in dry cleaning is
A. ethanol.
B. methanol.
C. tetrabromoethane.
D. tetrachloromethane.
20. Which of the following is an alloy of mercury?
A. Soft solder.
B. Coinage bronze.
C Amalgam.
D. Duralumium.
21. Which of these is not a physical property of water?
A. Can be used to dissolve organic substances
B Has boiling point of 100°C
C. Has a density of 1 gem -3 at 4°C
D. Has a freezing point of O°C
22. The cleansing action of soap in hard water is not satisfactory because soap
A. forms insoluble calcium and magnesium salts.
B. is made from fats and oils.
C. has an organic component.
D. alters surface tension of water.
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NABTEB Chemistry Theory Questions
SECTION B ESSAY (100 Marks)
Time: 1 Hour 40 Minutes
Answer four questions in all.
All questions carry equal marks.
1. (a) State three postulates of daltons atomic theory.
(b) Match the appropriate separation technique against each of the following mixtures;
(i) Muddy water.
(ii) Mixture of dyes
(iii)Liquid A(BP 53°C) and liquid B(BP 57 °C )
(c) Mention:
(i) two monoatomic gases.
(ii) one liquid element.
(iii) two elements that exist as molecules.
(d) What is an empirical formula?
(e) A hydrocarbon with vapour density of 15, contains 0.48g of carbon and 0.1 g of hydrogen.
Calculate its;
(i) empirical formula.
(ii) molecular formula.
(iii) Describe contact process for the manufacture of tetraoxosulphate (vi) add
2.(a) Define the rate of a chemical reaction
(b) Consider the following reaction:
Na2S2 O2 (aq) + 2HCl(aq) –> 2NaCL(aq) + H2O(l) + SO2 (g) + S(s)
(i) Which of the products can readily be used to measure rate of reaction?
(ii) list two factors that can affect the rate of this reaction.
(ii) Name two instruments which can be used to measure the factors in 2(bii) above
(c) What are basic oxides?
(d) Classify the following as addic, basic, amphoteric or neutral oxides:
(i) PbO
(ii) CO
(iii) Al2 O3
(iv) CO2
(e) State the function of MnO2 in:
(i)The laboratory preparation of oxygen.
(i) A dry cell
(f) State the shape and the maximum number of elections than can fully fill the following orbitals:
(i) S – Orbital
(ii) P – Orbital
(g) State Charle’s law.
(h) A cylinder contains 4.4g of carbon (IV) oxide at pressure of 820mmHg. Determine its volume at 56°C under the same pressure when initial temperature was 27 °C .
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Free NABTEB Objective Past Questions in Chemistry
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Link 1: Free NBC/NTC Chemistry Past Questions
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