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