- 1. The gas evolved when dilute tetraoxosulphate (vi) acid reacts with sodium hydrogen trioxocarbonate(iv) is -----------.
A) Sulphur(iv) oxide
B) Oxygen
C) Hydrogen
D) Carbon (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 a giant molecule
B) Has no free valence electrons
C) Is solid at room temperature
D) Contains no bonded electrons
- 4. Animal charcoal differs from wood charcoal in that it ................
A) Has a good carbon content
B) Has a dark colour
C) Is a good absorbent
D) Is rich in phosphate content
- 5. Which of the following correctly describes the structure of graphite.
A) Layer lattice
B) Ionic lattice
C) Molecular solid
D) Network structure
- 6. The liquid product of the destructive distillation of coal is ............
A) Aqueous ammonia
B) Coal gas
C) Ammoniacal liquor
D) Ethanol
- 7. A salt that absorbs moisture from the atmosphere without forming solution is said to be.......
A) Efflorescent
B) Deliquescent
C) Insoluble
D) Hygroscopic
- 8. Which of the following ionic value is acidic?
A) 6.7
B) 1.5
C) 10.0
D) 7.5
- 9. Concentrated tetraoxosulphate (iv) acid is used as a drying agent for most gases because it is............
A) Corrosive
B) Efflorescent
C) Hygroscopic
D) Deliquescent
- 10. Which of the following methods is suitable for preparing insoluble salts?
A) Neutralisation
B) Oxidation
C) Double decomposition
D) Thermal 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) Complex salt
C) Basic salt
D) Normal salt
- 12. which of the following would change the colour of blue litmus paper? An aqueous solution of:
A) Sodium chloride
B) Potassium hydroxide
C) Ammonium
D) Chloride
- 13. The loss of molecules of water of crystallisation to the atmosphere by some crystalline salts in known as ..........
A) Fluorescence
B) Deliquescence
C) Efflorescence
D) Effervescence
- 14. The following oxides react with both acids and bases to form salts except ...........
A) Aluminium oxide
B) Lead II oxide
C) Carbon (iv) oxide
D) Zinc oxide
- 15. Which of the following is a normal salt?
A) Zn(OH)Cl
B) KHSO4
C) Ca(HCO3)_2
D) (NH4)_2SO4
- 16. The alkaline nature of an aqueous solution of sodium trioxocarbonate (iv) is due to the process of...........
A) Dehydration
B) Hydrolysis
C) Hydration
D) Decomposition
- 17. When an acid anhydride dissolves in water, the solution formed would have pH ......
A) Equal to 14
B) Higher than 7
C) Lower than 7
D) Equal to 7
- 18. The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its.........
A) Acidity
B) Basicity
C) pH
D) Concentration
- 19. The use of diamond in abrasives is due to its........
A) Durability
B) Metallic lustre
C) Hardness
D) High melting point
- 20. Producer gas is a mixture of ......
A) CO2 and N2
B) CO2 and H2
C) CO and N2
D) CO and H2
- 21. Which of the following is not a source of hydrocarbons?
A) Nuclear energy
B) Natural gas
C) Fossil fuels
D) Biomass
- 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) Alkynes
D) Alcohols
- 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) Diesel
B) Kerosene
C) Lubricating oil
D) Gasoline
- 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) Nitrogen gas (N2)
D) Carbon dioxide gas (CO2)
- 27. Which of the following is a property of trioxocarbonate(IV) acid?
A) It is highly flammable
B) It is a weak acid
C) It has a sweet taste
D) It is a solid at room temperature
- 28. Trioxocarbonate(IV) acid is commonly used in which industry?
A) Pharmaceutical industry
B) Textile industry
C) Food and beverage industry
D) Automotive 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) CO32-
B) CO2
C) HCO3-
D) H2CO3
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