- 1. The gas evolved when dilute tetraoxosulphate (vi) acid reacts with sodium hydrogen trioxocarbonate(iv) is -----------.
A) Carbon (iv) oxide
B) Hydrogen
C) Sulphur(iv) oxide
D) Oxygen
- 2. The existence of an electron in two or more forms in the same physical state is known as.........
A) Isotopy
B) Allotropy
C) Isomerism
D) Hybridisation
- 3. Diamond does not conduct electricity because it .........
A) Contains no bonded electrons
B) Has no free valence electrons
C) Is solid at room temperature
D) Is a giant molecule
- 4. Animal charcoal differs from wood charcoal in that it ................
A) Is a good absorbent
B) Is rich in phosphate content
C) Has a good carbon content
D) Has a dark colour
- 5. Which of the following correctly describes the structure of graphite.
A) Molecular solid
B) Ionic lattice
C) Layer lattice
D) Network structure
- 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) Hygroscopic
B) Insoluble
C) Efflorescent
D) Deliquescent
- 8. Which of the following ionic value is acidic?
A) 7.5
B) 6.7
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) Deliquescent
C) Corrosive
D) Efflorescent
- 10. Which of the following methods is suitable for preparing insoluble salts?
A) Neutralisation
B) Oxidation
C) Thermal decomposition
D) Double decomposition
- 11. Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?
A) Normal salt
B) Acidic 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) Ammonium
B) Chloride
C) Potassium hydroxide
D) Sodium chloride
- 13. The loss of molecules of water of crystallisation to the atmosphere by some crystalline salts in known as ..........
A) Deliquescence
B) Fluorescence
C) Efflorescence
D) Effervescence
- 14. The following oxides react with both acids and bases to form salts except ...........
A) Zinc oxide
B) Lead II oxide
C) Carbon (iv) oxide
D) Aluminium oxide
- 15. Which of the following is a normal salt?
A) Ca(HCO3)_2
B) Zn(OH)Cl
C) (NH4)_2SO4
D) KHSO4
- 16. The alkaline nature of an aqueous solution of sodium trioxocarbonate (iv) is due to the process of...........
A) Decomposition
B) Hydrolysis
C) Hydration
D) Dehydration
- 17. When an acid anhydride dissolves in water, the solution formed would have pH ......
A) Lower than 7
B) Equal to 7
C) Higher than 7
D) Equal to 14
- 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) Metallic lustre
B) Durability
C) Hardness
D) High melting point
- 20. Producer gas is a mixture of ......
A) CO2 and H2
B) CO2 and N2
C) CO and H2
D) CO 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 sulfur
C) Carbon and hydrogen
D) Carbon and nitrogen
- 23. Which of the following is not a class of hydrocarbons?
A) Alcohols
B) Alkenes
C) Alkanes
D) Alkynes
- 24. Crude oil is a mixture of hydrocarbons primarily derived from:
A) Plants and animals
B) Synthetic chemical reactions
C) Geological processes over millions of years
D) Volcanic eruptions
- 25. Which fraction of crude oil is commonly used as fuel for transportation?
A) Diesel
B) Gasoline
C) Lubricating oil
D) Kerosene
- 26. Trioxocarbonate(IV) acid, also known as carbonic acid, is prepared by the reaction of water with which gas?
A) Nitrogen gas (N2)
B) Carbon dioxide gas (CO2)
C) Hydrogen gas (H2)
D) Oxygen gas (O2)
- 27. Which of the following is a property of trioxocarbonate(IV) acid?
A) It has a sweet taste
B) It is highly flammable
C) It is a weak acid
D) It is a solid at room temperature
- 28. Trioxocarbonate(IV) acid is commonly used in which industry?
A) Automotive industry
B) Textile industry
C) Food and beverage industry
D) Pharmaceutical industry
- 29. 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) Effervescence occurs when acid is added
C) A green flame is observed
D) Blue litmus paper turns red
- 30. What is the chemical formula of trioxocarbonate(IV) acid?
A) CO2
B) CO32-
C) HCO3-
D) H2CO3
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