- 1. The gas evolved when dilute tetraoxosulphate (vi) acid reacts with sodium hydrogen trioxocarbonate(iv) is -----------.
A) Hydrogen
B) Carbon (iv) oxide
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) Hybridisation
C) Isotopy
D) Allotropy
- 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) 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) Network structure
B) Layer lattice
C) Molecular solid
D) Ionic lattice
- 6. The liquid product of the destructive distillation of coal is ............
A) Ethanol
B) Ammoniacal liquor
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) Efflorescent
C) Deliquescent
D) Hygroscopic
- 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) Corrosive
B) Deliquescent
C) Efflorescent
D) Hygroscopic
- 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) Basic salt
B) Normal salt
C) Acidic salt
D) Complex 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) Ammonium
D) 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) Effervescence
D) Efflorescence
- 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) Zn(OH)Cl
B) KHSO4
C) (NH4)_2SO4
D) Ca(HCO3)_2
- 16. The alkaline nature of an aqueous solution of sodium trioxocarbonate (iv) is due to the process of...........
A) Dehydration
B) Hydrolysis
C) Decomposition
D) Hydration
- 17. When an acid anhydride dissolves in water, the solution formed would have pH ......
A) Higher than 7
B) Equal to 7
C) Lower 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) Basicity
B) Concentration
C) pH
D) Acidity
- 19. The use of diamond in abrasives is due to its........
A) Metallic lustre
B) Hardness
C) High melting point
D) Durability
- 20. Producer gas is a mixture of ......
A) CO and H2
B) CO2 and H2
C) CO and N2
D) CO2 and N2
- 21. Which of the following is not a source of hydrocarbons?
A) Fossil fuels
B) Nuclear energy
C) Biomass
D) Natural gas
- 22. Hydrocarbons are organic compounds composed of which two elements?
A) Carbon and hydrogen
B) Carbon and oxygen
C) Carbon and nitrogen
D) Carbon and sulfur
- 23. Which of the following is not a class of hydrocarbons?
A) Alkenes
B) Alkynes
C) Alcohols
D) Alkanes
- 24. Crude oil is a mixture of hydrocarbons primarily derived from:
A) Synthetic chemical reactions
B) Plants and animals
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) Kerosene
C) Gasoline
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) Hydrogen gas (H2)
C) Carbon dioxide gas (CO2)
D) Nitrogen gas (N2)
- 27. Which of the following is a property of trioxocarbonate(IV) acid?
A) It has a sweet taste
B) It is a solid at room temperature
C) It is highly flammable
D) It is a weak acid
- 28. Trioxocarbonate(IV) acid is commonly used in which industry?
A) Textile industry
B) Food and beverage industry
C) Pharmaceutical industry
D) Automotive industry
- 29. Which of the following is a test for the presence of the trioxocarbonate(IV) ion, CO32-?
A) Effervescence occurs when acid is added
B) A green flame is observed
C) A white precipitate forms when silver nitrate is added
D) Blue litmus paper turns red
- 30. What is the chemical formula of trioxocarbonate(IV) acid?
A) H2CO3
B) HCO3-
C) CO2
D) CO32-
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