- 1. The gas evolved when dilute tetraoxosulphate (vi) acid reacts with sodium hydrogen trioxocarbonate(iv) is -----------.
A) Oxygen
B) Hydrogen
C) Sulphur(iv) oxide
D) Carbon (iv) oxide
- 2. The existence of an electron in two or more forms in the same physical state is known as.........
A) Isotopy
B) Isomerism
C) Hybridisation
D) Allotropy
- 3. Diamond does not conduct electricity because it .........
A) Is solid at room temperature
B) Is a giant molecule
C) Contains no bonded electrons
D) Has no free valence electrons
- 4. Animal charcoal differs from wood charcoal in that it ................
A) Is a good absorbent
B) Has a good carbon content
C) Is rich in phosphate content
D) Has a dark colour
- 5. Which of the following correctly describes the structure of graphite.
A) Molecular solid
B) Network structure
C) Ionic lattice
D) Layer lattice
- 6. The liquid product of the destructive distillation of coal is ............
A) Ammoniacal liquor
B) Coal gas
C) Aqueous ammonia
D) Ethanol
- 7. A salt that absorbs moisture from the atmosphere without forming solution is said to be.......
A) Insoluble
B) Deliquescent
C) Hygroscopic
D) Efflorescent
- 8. Which of the following ionic value is acidic?
A) 1.5
B) 7.5
C) 10.0
D) 6.7
- 9. Concentrated tetraoxosulphate (iv) acid is used as a drying agent for most gases because it is............
A) Deliquescent
B) Hygroscopic
C) Corrosive
D) Efflorescent
- 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) Basic salt
B) Normal 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) Sodium chloride
B) Ammonium
C) Chloride
D) Potassium hydroxide
- 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) Zinc oxide
D) Lead II oxide
- 15. Which of the following is a normal salt?
A) KHSO4
B) (NH4)_2SO4
C) Zn(OH)Cl
D) Ca(HCO3)_2
- 16. The alkaline nature of an aqueous solution of sodium trioxocarbonate (iv) is due to the process of...........
A) Hydrolysis
B) Dehydration
C) Hydration
D) Decomposition
- 17. When an acid anhydride dissolves in water, the solution formed would have pH ......
A) Equal to 7
B) Lower than 7
C) Higher 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) Acidity
B) Concentration
C) pH
D) Basicity
- 19. The use of diamond in abrasives is due to its........
A) Hardness
B) Durability
C) High melting point
D) Metallic lustre
- 20. Producer gas is a mixture of ......
A) CO and N2
B) CO2 and H2
C) CO2 and N2
D) CO and H2
- 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) Alcohols
B) Alkynes
C) Alkanes
D) Alkenes
- 24. Crude oil is a mixture of hydrocarbons primarily derived from:
A) Synthetic chemical reactions
B) Plants and animals
C) Volcanic eruptions
D) Geological processes over millions of years
- 25. Which fraction of crude oil is commonly used as fuel for transportation?
A) Kerosene
B) Gasoline
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) Hydrogen gas (H2)
D) Carbon dioxide gas (CO2)
- 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) Food and beverage industry
B) Pharmaceutical industry
C) Textile industry
D) Automotive 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 green flame is observed
C) A white precipitate forms when silver nitrate is added
D) Effervescence occurs when acid is added
- 30. What is the chemical formula of trioxocarbonate(IV) acid?
A) H2CO3
B) CO2
C) HCO3-
D) CO32-
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