- 1. The gas evolved when dilute tetraoxosulphate (vi) acid reacts with sodium hydrogen trioxocarbonate(iv) is -----------.
A) Hydrogen
B) Oxygen
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) Hybridisation
C) Isomerism
D) Isotopy
- 3. Diamond does not conduct electricity because it .........
A) Is a giant molecule
B) Is solid at room temperature
C) Contains no bonded electrons
D) Has no free valence electrons
- 4. Animal charcoal differs from wood charcoal in that it ................
A) Has a dark colour
B) Is a good absorbent
C) Has a good carbon content
D) Is rich in phosphate content
- 5. Which of the following correctly describes the structure of graphite.
A) Layer lattice
B) Network structure
C) Molecular solid
D) Ionic lattice
- 6. The liquid product of the destructive distillation of coal is ............
A) Aqueous ammonia
B) Ethanol
C) Ammoniacal liquor
D) Coal gas
- 7. A salt that absorbs moisture from the atmosphere without forming solution is said to be.......
A) Hygroscopic
B) Efflorescent
C) Deliquescent
D) Insoluble
- 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) Corrosive
B) Efflorescent
C) Hygroscopic
D) Deliquescent
- 10. Which of the following methods is suitable for preparing insoluble salts?
A) Thermal decomposition
B) Neutralisation
C) Double decomposition
D) Oxidation
- 11. Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?
A) Complex salt
B) Basic salt
C) Acidic salt
D) Normal salt
- 12. which of the following would change the colour of blue litmus paper? An aqueous solution of:
A) Ammonium
B) Potassium hydroxide
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) Fluorescence
B) Effervescence
C) Deliquescence
D) Efflorescence
- 14. The following oxides react with both acids and bases to form salts except ...........
A) Aluminium oxide
B) Zinc oxide
C) Lead II oxide
D) Carbon (iv) 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) Hydration
B) Decomposition
C) Dehydration
D) Hydrolysis
- 17. When an acid anhydride dissolves in water, the solution formed would have pH ......
A) Higher than 7
B) Lower than 7
C) Equal to 14
D) Equal to 7
- 18. The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its.........
A) Concentration
B) Basicity
C) pH
D) Acidity
- 19. The use of diamond in abrasives is due to its........
A) Durability
B) Metallic lustre
C) High melting point
D) Hardness
- 20. Producer gas is a mixture of ......
A) CO and N2
B) CO2 and N2
C) CO2 and H2
D) CO and H2
- 21. Which of the following is not a source of hydrocarbons?
A) Nuclear energy
B) Fossil fuels
C) Natural gas
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) Alkanes
B) Alkenes
C) Alcohols
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) Diesel
D) Lubricating oil
- 26. Trioxocarbonate(IV) acid, also known as carbonic acid, is prepared by the reaction of water with which gas?
A) Hydrogen gas (H2)
B) Oxygen gas (O2)
C) Carbon dioxide gas (CO2)
D) Nitrogen gas (N2)
- 27. Which of the following is a property of trioxocarbonate(IV) acid?
A) It is a weak acid
B) It is highly flammable
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) Food and beverage industry
B) Automotive industry
C) Pharmaceutical industry
D) Textile 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) 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) H2CO3
C) CO2
D) CO32-
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