- 1. The gas evolved when dilute tetraoxosulphate (vi) acid reacts with sodium hydrogen trioxocarbonate(iv) is -----------.
A) Carbon (iv) oxide
B) Hydrogen
C) Oxygen
D) Sulphur(iv) oxide
- 2. The existence of an electron in two or more forms in the same physical state is known as.........
A) Isomerism
B) Isotopy
C) Hybridisation
D) Allotropy
- 3. Diamond does not conduct electricity because it .........
A) Is a giant molecule
B) Contains no bonded electrons
C) Is solid at room temperature
D) Has no free valence electrons
- 4. Animal charcoal differs from wood charcoal in that it ................
A) Is rich in phosphate content
B) Has a good carbon content
C) Has a dark colour
D) Is a good absorbent
- 5. Which of the following correctly describes the structure of graphite.
A) Ionic lattice
B) Molecular solid
C) Network structure
D) Layer lattice
- 6. The liquid product of the destructive distillation of coal is ............
A) Ethanol
B) Ammoniacal liquor
C) Coal gas
D) Aqueous ammonia
- 7. A salt that absorbs moisture from the atmosphere without forming solution is said to be.......
A) Hygroscopic
B) Insoluble
C) Deliquescent
D) Efflorescent
- 8. Which of the following ionic value is acidic?
A) 6.7
B) 7.5
C) 1.5
D) 10.0
- 9. Concentrated tetraoxosulphate (iv) acid is used as a drying agent for most gases because it is............
A) Hygroscopic
B) Efflorescent
C) Deliquescent
D) Corrosive
- 10. Which of the following methods is suitable for preparing insoluble salts?
A) Oxidation
B) Double decomposition
C) Neutralisation
D) Thermal decomposition
- 11. Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?
A) Basic salt
B) Complex salt
C) Acidic salt
D) Normal salt
- 12. which of the following would change the colour of blue litmus paper? An aqueous solution of:
A) Potassium hydroxide
B) Chloride
C) Sodium chloride
D) Ammonium
- 13. The loss of molecules of water of crystallisation to the atmosphere by some crystalline salts in known as ..........
A) Efflorescence
B) Fluorescence
C) Effervescence
D) Deliquescence
- 14. The following oxides react with both acids and bases to form salts except ...........
A) Zinc oxide
B) Lead II oxide
C) Aluminium oxide
D) Carbon (iv) oxide
- 15. Which of the following is a normal salt?
A) (NH4)_2SO4
B) Ca(HCO3)_2
C) KHSO4
D) Zn(OH)Cl
- 16. The alkaline nature of an aqueous solution of sodium trioxocarbonate (iv) is due to the process of...........
A) Hydration
B) Hydrolysis
C) Decomposition
D) Dehydration
- 17. When an acid anhydride dissolves in water, the solution formed would have pH ......
A) Higher than 7
B) Lower than 7
C) Equal to 14
D) Equal to 7
- 18. The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its.........
A) pH
B) Concentration
C) Acidity
D) Basicity
- 19. The use of diamond in abrasives is due to its........
A) Metallic lustre
B) Durability
C) Hardness
D) High melting point
- 20. Producer gas is a mixture of ......
A) CO and H2
B) CO2 and N2
C) CO and N2
D) CO2 and H2
- 21. Which of the following is not a source of hydrocarbons?
A) Fossil fuels
B) Biomass
C) Natural gas
D) Nuclear energy
- 22. Hydrocarbons are organic compounds composed of which two elements?
A) Carbon and sulfur
B) Carbon and hydrogen
C) Carbon and nitrogen
D) Carbon and oxygen
- 23. Which of the following is not a class of hydrocarbons?
A) Alkynes
B) Alkenes
C) Alcohols
D) Alkanes
- 24. Crude oil is a mixture of hydrocarbons primarily derived from:
A) Plants and animals
B) Volcanic eruptions
C) Geological processes over millions of years
D) Synthetic chemical reactions
- 25. Which fraction of crude oil is commonly used as fuel for transportation?
A) Kerosene
B) Gasoline
C) Diesel
D) Lubricating oil
- 26. Trioxocarbonate(IV) acid, also known as carbonic acid, is prepared by the reaction of water with which gas?
A) Hydrogen gas (H2)
B) Oxygen gas (O2)
C) Carbon dioxide gas (CO2)
D) Nitrogen gas (N2)
- 27. Which of the following is a property of trioxocarbonate(IV) acid?
A) It is a solid at room temperature
B) It is a weak acid
C) It has a sweet taste
D) It is highly flammable
- 28. Which of the following is a test for the presence of the trioxocarbonate(IV) ion, CO32-?
A) A green flame is observed
B) Blue litmus paper turns red
C) Effervescence occurs when acid is added
D) A white precipitate forms when silver nitrate is added
- 29. What quantity of electrons (in mole) is lost when one mole of ion (II) ions is oxidised to ion (III) ions.
A) 4 moles
B) 3 moles
C) 2 moles
D) 1 mole
- 30. The oxidation number of X in XO4³- is
........
A) +3
B) +2
C) +4
D) +5
- 31. The collective name for elements in the group seven is the ----------
A) alkalin-earth metals
B) inert gases
C) alkali metals
D) halogens
- 32. The position of an element on the periodic table is determined by........
A) the number of protons in its atom.
B) its density
C) its relative atomic mass
D) its atomic radius
- 33. The element with electronic configuration Is2 2s2 2p6 3s2 is
.....
A) an inert gas
B) a metal
C) a halogen
D) a non-metal
- 34. The electronic configuration of elements X, Y and Z are as follows X- Is2 2s2 2p6 3s2 Y - Is² 2s² 2p6 3s2 3p¹ Z-Is² 2s²2p6 3s2 3p2 To which period do X, Y and Z belong?
A) 3
B) 1
C) 4
D) 2
- 35. Which of the following statements about the elements, Na, Mg, Al and Si is / are true?
I. They are all in period 3 of the periodic table II. Mg is more electropositive than Si
III. Electropositivity decreases from Na to Si IV. Si is the most electropositive element.
A) I and IV only
B) I only
C) I, II, III and IV
D) I, II and III only
- 36. The element with the electronic
configuration Is2 2s2 2p6 3s2 3p6 3d2 4s² is a/an
A) transition metal
B) group II element
C) group IV element.
D) alkaline earth metal
- 37. Use the diagram above to answer the following question. Which of the following pairs of letters denotes elements containing the same number of electrons in their outermost shells?
A) T and P
B) R and X
C) P and Q
D) S and T
- 38. Use the diagram above to answer the following question. What letter represents an element that undergoes covalent bonding?
A) S
B) T
C) Q
D) R
- 39. What is the most probable group of an element which is a soft, silvery-white solid and reacts violently with water?
A) Group 6
B) Group 1
C) Group 4
D) Group 7
- 40. Lithium and sodium show similar chemical properties. Which of the following statements is not true about the two elements?
A) They have equal number of electrons in their outermost shells
B) Both exist in the +1 oxidation state in their compound
C) They belong to the same group in the periodic table
D) They are in the same period in the periodic table
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