- 1. The gas evolved when dilute tetraoxosulphate (vi) acid reacts with sodium hydrogen trioxocarbonate(iv) is -----------.
A) Oxygen
B) Hydrogen
C) Carbon (iv) oxide
D) Sulphur(iv) oxide
- 2. The existence of an electron in two or more forms in the same physical state is known as.........
A) Allotropy
B) Isotopy
C) Hybridisation
D) Isomerism
- 3. Diamond does not conduct electricity because it .........
A) Is solid at room temperature
B) Has no free valence electrons
C) Contains no bonded electrons
D) Is a giant molecule
- 4. Animal charcoal differs from wood charcoal in that it ................
A) Is rich in phosphate content
B) Has a good carbon content
C) Is a good absorbent
D) Has a dark colour
- 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) Coal gas
B) Ethanol
C) Aqueous ammonia
D) Ammoniacal liquor
- 7. A salt that absorbs moisture from the atmosphere without forming solution is said to be.......
A) Insoluble
B) Deliquescent
C) Efflorescent
D) Hygroscopic
- 8. Which of the following ionic value is acidic?
A) 10.0
B) 7.5
C) 6.7
D) 1.5
- 9. Concentrated tetraoxosulphate (iv) acid is used as a drying agent for most gases because it is............
A) Efflorescent
B) Hygroscopic
C) Corrosive
D) Deliquescent
- 10. Which of the following methods is suitable for preparing insoluble salts?
A) Oxidation
B) Double decomposition
C) Thermal decomposition
D) Neutralisation
- 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) Basic salt
C) Complex salt
D) Acidic salt
- 12. which of the following would change the colour of blue litmus paper? An aqueous solution of:
A) Potassium hydroxide
B) Ammonium
C) Sodium chloride
D) Chloride
- 13. The loss of molecules of water of crystallisation to the atmosphere by some crystalline salts in known as ..........
A) Deliquescence
B) Effervescence
C) Efflorescence
D) Fluorescence
- 14. The following oxides react with both acids and bases to form salts except ...........
A) Aluminium oxide
B) Carbon (iv) oxide
C) Lead II 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) Hydrolysis
B) Hydration
C) Dehydration
D) Decomposition
- 17. When an acid anhydride dissolves in water, the solution formed would have pH ......
A) Equal to 14
B) Equal to 7
C) Higher than 7
D) Lower 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) Metallic lustre
C) High melting point
D) Durability
- 20. Producer gas is a mixture of ......
A) CO and N2
B) CO2 and N2
C) CO and H2
D) CO2 and H2
- 21. Which of the following is not a source of hydrocarbons?
A) Biomass
B) Nuclear energy
C) Natural gas
D) Fossil fuels
- 22. Hydrocarbons are organic compounds composed of which two elements?
A) Carbon and oxygen
B) Carbon and nitrogen
C) Carbon and hydrogen
D) Carbon and sulfur
- 23. Which of the following is not a class of hydrocarbons?
A) Alkenes
B) Alkanes
C) Alcohols
D) Alkynes
- 24. Crude oil is a mixture of hydrocarbons primarily derived from:
A) Plants and animals
B) Volcanic eruptions
C) Synthetic chemical reactions
D) Geological processes over millions of years
- 25. Which fraction of crude oil is commonly used as fuel for transportation?
A) Gasoline
B) Diesel
C) Kerosene
D) Lubricating oil
- 26. Trioxocarbonate(IV) acid, also known as carbonic acid, is prepared by the reaction of water with which gas?
A) Oxygen gas (O2)
B) Nitrogen gas (N2)
C) Hydrogen gas (H2)
D) Carbon dioxide gas (CO2)
- 27. Which of the following is a property of trioxocarbonate(IV) acid?
A) It is a weak acid
B) It is a solid at room temperature
C) It is highly flammable
D) It has a sweet taste
- 28. Trioxocarbonate(IV) acid is commonly used in which industry?
A) Automotive industry
B) Textile industry
C) Pharmaceutical industry
D) Food and beverage 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) Blue litmus paper turns red
C) A green flame is observed
D) Effervescence occurs when acid is added
- 30. What is the chemical formula of trioxocarbonate(IV) acid?
A) HCO3-
B) CO32-
C) CO2
D) H2CO3
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