- 1. The gas evolved when dilute tetraoxosulphate (vi) acid reacts with sodium hydrogen trioxocarbonate(iv) is -----------.
A) Oxygen
B) Carbon (iv) oxide
C) Hydrogen
D) Sulphur(iv) oxide
- 2. The existence of an electron in two or more forms in the same physical state is known as.........
A) Hybridisation
B) Isotopy
C) Isomerism
D) Allotropy
- 3. Diamond does not conduct electricity because it .........
A) Has no free valence electrons
B) Contains no bonded electrons
C) Is solid at room temperature
D) Is a giant molecule
- 4. Animal charcoal differs from wood charcoal in that it ................
A) Has a good carbon content
B) Is rich in phosphate 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) Network structure
C) Layer lattice
D) Molecular solid
- 6. The liquid product of the destructive distillation of coal is ............
A) Ethanol
B) Coal gas
C) Aqueous ammonia
D) Ammoniacal liquor
- 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) 10.0
B) 7.5
C) 1.5
D) 6.7
- 9. Concentrated tetraoxosulphate (iv) acid is used as a drying agent for most gases because it is............
A) Corrosive
B) Hygroscopic
C) Efflorescent
D) Deliquescent
- 10. Which of the following methods is suitable for preparing insoluble salts?
A) Oxidation
B) Neutralisation
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) Acidic salt
B) Basic salt
C) Complex 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) Sodium chloride
C) Chloride
D) Ammonium
- 13. The loss of molecules of water of crystallisation to the atmosphere by some crystalline salts in known as ..........
A) Effervescence
B) Efflorescence
C) Fluorescence
D) Deliquescence
- 14. The following oxides react with both acids and bases to form salts except ...........
A) Zinc oxide
B) Carbon (iv) oxide
C) Aluminium oxide
D) Lead II oxide
- 15. Which of the following is a normal salt?
A) KHSO4
B) Ca(HCO3)_2
C) (NH4)_2SO4
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) Dehydration
C) Decomposition
D) Hydrolysis
- 17. When an acid anhydride dissolves in water, the solution formed would have pH ......
A) Equal to 14
B) Higher than 7
C) Equal to 7
D) Lower than 7
- 18. The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its.........
A) Basicity
B) Concentration
C) pH
D) Acidity
- 19. The use of diamond in abrasives is due to its........
A) Metallic lustre
B) High melting point
C) Durability
D) Hardness
- 20. Producer gas is a mixture of ......
A) CO and H2
B) CO2 and N2
C) CO2 and H2
D) CO and N2
- 21. Which of the following is not a source of hydrocarbons?
A) Nuclear energy
B) Biomass
C) Fossil fuels
D) Natural gas
- 22. Hydrocarbons are organic compounds composed of which two elements?
A) Carbon and nitrogen
B) Carbon and sulfur
C) Carbon and hydrogen
D) Carbon and oxygen
- 23. Which of the following is not a class of hydrocarbons?
A) Alkenes
B) Alcohols
C) Alkanes
D) Alkynes
- 24. Crude oil is a mixture of hydrocarbons primarily derived from:
A) Volcanic eruptions
B) Plants and animals
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) Gasoline
B) Kerosene
C) Lubricating oil
D) Diesel
- 26. Trioxocarbonate(IV) acid, also known as carbonic acid, is prepared by the reaction of water with which gas?
A) Nitrogen gas (N2)
B) Oxygen gas (O2)
C) Carbon dioxide gas (CO2)
D) Hydrogen gas (H2)
- 27. Which of the following is a property of trioxocarbonate(IV) acid?
A) It is a solid at room temperature
B) It is highly flammable
C) It has a sweet taste
D) It is a weak acid
- 28. Trioxocarbonate(IV) acid is commonly used in which industry?
A) Textile industry
B) Pharmaceutical industry
C) Automotive industry
D) Food and beverage industry
- 29. Which of the following is a test for the presence of the trioxocarbonate(IV) ion, CO32-?
A) Blue litmus paper turns red
B) A white precipitate forms when silver nitrate is added
C) Effervescence occurs when acid is added
D) A green flame is observed
- 30. What is the chemical formula of trioxocarbonate(IV) acid?
A) CO32-
B) HCO3-
C) CO2
D) H2CO3
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