Authentic And Free NABTEB Chemistry Questions 2023.

Authentic And Free NABTEB Chemistry Questions 2023.-Are you a candidate looking for questions for the 2023 NABTEB chemistry exam? If that’s the case, you’ve come to the right place because the Professionalmarks.com team will show you how to prepare for the chemistry past questions on the 2023 NABTEB exam.
Professionalmarks.com is aware of the emotions students feel when an external exam is approaching. As a result, we make it a point to ensure that every question we publish is the best option question you will encounter on your exam. Authentic And Free NABTEB Chemistry Questions 2023.

The purpose of these previous questions is to determine your level of preparation for the GCE exam. Knowing how NABTEB sets their questions and how they want them answered will help you. Answers to all previous questions are made available on the platform by NABTEB itself. In the meantime, if you pay close attention to the previous question, you might come across some questions that will be asked on the NABTEB exam you’re studying for.

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Authentic And Free NABTEB Chemistry Questions 2023.

Below are the chemistry questions:

1. Which of the following statements is NOT correct?

A. The average kinetic energy of a gas is directly proportional to its temperature
B. At constant temperature, the volume of a gas increases as the pressure increases
C. The pressure of a gas is inversely proportional to the density
D. The temperature of a gas is directly proportional to its volume

2. Zinc Oxide is a?

A. Basic Oxide
B. Acidic Oxide
C. Amphoteric Oxide
D. Neutral Oxide
E. Reactive Oxide

3. When sodium chloride and metallic sodium are each dissolved in water – Authentic And Free NABTEB Chemistry Questions 2023.

A. both processes are exothermic
B. both processes are endothermic
C. the dissolution of metallic sodium is endothermic
D. the dissolution of metallic sodium is exothermic
E. the dissolution of sodium chloride is explosive

4. The periodic classification of elements is an arrangement of the elements in order of their

A. Atomic Weights
B. Isotopic Weights
C. Molecular Weights
D. Atomic Numbers
E. Atomic Masses

5. In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?

A. 5cm3
B. 10cm3
C. 20cm3
D. 25cm3
E. 50cm3

Authentic And Free NABTEB Chemistry Questions 2023.

6. A small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone?

A. distillation
B. sublimation
C. precipitation
D. evaporation
E. decomposition

7. Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

A. P will form an electrovalent bond with R
B. Q will form a covalent bond with S
C. R will form an electrovalent bond with S
D. Q will form an electrovalent bond with S
E. Q will form a covalent bond with R

8. An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the

A. law of multiple proportions
B. law of chemical proportions
C. law of simple proportions
D. law of conservation of mass
E. law of definite proportions

9. The oxidation state of chlorine in potassium chlorate is?

A. +1
B. +2
C. +3
D. +5
E. +7

10. When air which contains the gases Oxygen, nitrogen, carbon dioxide, water vapor, and rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are? Authentic And Free NABTEB Chemistry Questions 2023.

A. nitrogen and carbondioxide
B. the rare gases
C. nitrogen and oxygen
D. nitrogen and the rare gases
E. nitrogen, carbondioxide and the rare gases

Authentic And Free NABTEB Chemistry Questions 2023.

11. When heat is absorbed during a chemical reaction, the reaction is said to be
    A. thermodynamic
    B. exothermic
    C. isothermal
    D. endothermic
    E. thermostatic
12. When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

A. disintegration
B. polymerization
C. cracking
D. degradation
E. distillation

13. The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore

A. none of these solutions is acidic
B. the pH of Y is made more acidic by addition of distilled water
C. Z is the most acidic solution
D. W is the most acidic solution
E. X is neutral

14. When each of the nitrates of Potassium, Magnesium and iron is heated,

A. all the nitrates decompose to their oxides
B. the nitrate of magnesium gives the nitrite and oxygen
C. the nitrates of iron magnesium and iron give the oxides
D. the nitrate of iron gives the nitrite and oxygen
E. the nitrate of the magnesium is not decomposed

15. Which of the following metals cannot replace hydrogen from water or steam?

A. Sodium
B. Magnesium
C. Iron
D. Calcium
E. Copper

16. A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by

A. boiling the water
B. adding excess calcium hydroxide
C. adding a calculated amount of calcium hydroxide
D. adding sodium carbonate
E. adding magnesium hydroxide

Authentic And Free NABTEB Chemistry Questions 2023.

17. During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,

A. the litmus turns blue but no gas is evolved
B. the litmus turns blue and oxygen is evolved
C. the litmus turns blue and hydrogen is evolved
D. the litmus turns red and oxygen is evolved
E. the litmus turns red and then becomes colourless

18. The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as; – Authentic And Free NABTEB Chemistry Questions 2023.

A. saponification
B. dehydration
C. esterification
D. hydrolysis
E. hydration

19. The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;

A. acetic acid and ethene
B. methanoic acid and ethene
C. methanoic acid and ethylene
D. ethanol and ethene
E. acetic acid and ethylene

20. If 30cm3 of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm3 of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

A. 9.3 sec
B. 14 sec
C. 21 sec
D. 28 sec
E. 30.3 sec

21. Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?

A. Tin
B. Zinc
C. Copper
D. Lead
E. Aluminium

Authentic And Free NABTEB Chemistry Questions 2023.

22. Which of the following gases may not be dried with concentrated sulphuric acid? – Authentic And Free NABTEB Chemistry Questions 2023.

A. HCl
B. N2
C. Cl2
D. SO2
E. NH3

23. Which of the following reactions does not take place in the smelting of iron in a blast furnace?

A. CaCO3(s) CaO(s) + CO2(g)
B. C(s) + O2(g) CO2(g)
C. 3FeCO(s) + 2OCO2(g) FeO4(s)
D. SiO2(s) + CaO(s) CaCO3(s)
E. CO2(g) + C(s) 2CO(g)

24. Which of the following is not a member of the homologous series of the paraffins (alkanes)?

A. C3H8
B. C5H12
C. C7H16
D. C15H32
E. C24H48

25. When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

A. ionic bond
B. electrovalent bond
C. covalent bond
D. co-ordinate bond
E. hydrogen bond

26. An example of an alcohol is

A. CCl4
B. CH3COOH
C. CHCl3
D. C2H6
E. CH3OH

27. The nucleus of an atom contains

A. protons only
B. neurons only
C. protons and electrons
D. neutrons and electrons
E. protons and neutrons

28. Hypochlorous acid is used as a bleach because

A. it is a strong acid
B. it yields chlorine readily in pure water
C. it is an oxidising agent
D. it is a weak acid
E. it is a reducing agent

29. The normal boiling point of a liquid is defined as?

A. the temperature at which its vapour pressure equals the atmospheric pressure
B. the temperature at which bubbles begin to form
C. the temperature at which the vapour pressure equals 1 temperature
D. the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid
E. the temperature at which the space above the liquid is saturated

30. Which of the following compounds will form a solution if exposed to air?

A. Na2CO3.10H2O
B. NaNO3
C. CuSO4
D. CaCl2
E. Na2SO4.10H2O

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CONCLUSIONS: Authentic And Free NABTEB Chemistry Questions 2023.

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