PES SS 2 Chemistry 1st Term Exam 2025-2026
  • 1. Which of the following hydrocarbons is not an alkane?
A) C7H16
B) C3H6
C) C2H6
D) C8H18
  • 2. The organic compound with the formula C5H10 is an example of
A) alkene
B) alkanol
C) alkane
D) alkyne
  • 3. Which of the following is not among the characteristics of the homologous series?
A) The physical properties are similar.
B) Successive members differ in molecular formula by an addition of CH2
C) Members have the same general method of preparation.
D) Members share the same general method of preparation.
  • 4. Which of the following is not among the characteristics of organic compounds?
A) They are generally soluble in non-polar solvents.
B) Most organic compounds are non-polar.
C) They are mostly covalent.
D) They are generally soluble in water.
  • 5. Alkyl group has a general molecular formula shown above. Which of the options is an example of alkyl group?
A) C5H12
B) C2H6
C) C3H6
D) C4H9
  • 6. What is catenation?
A) It is the ease with which carbon combines with hydrogen, oxygen etc.
B) It is the ability of carbon to form single, double and tripple covalent bonds.
C) It is the exceptional ability of carbon atoms to combine with one another.
  • 7. Which of the following is an example of alkanol?
A) C3H7COOH
B) C3H7COCH3
C) C3H7CHO
D) C3H7OH
  • 8. Which of the following gases rekindles a glowing splinter?
A) Cl2
B) H2
C) O2
D) CO2
  • 9. Which of the following is not an acidic oxide?
A) CO2
B) SO2
C) Na2O
D) NO2
  • 10. Which of the following is not a basic oxide?
A) MgO
B) SO2
C) Na2O
D) K2O
  • 11. Which of the following is an example of amphoteric oxide?
A) K2O
B) Na2O
C) CaO
D) ZnO
  • 12. Which of the following is an example of neutral oxide?
A) ZnO
B) CO
C) MgO
D) CO2
  • 13. Which of the following is not a type of oxide?
A) neutral oxide
B) acidic oxide
C) basic oxide
D) hydrochloric oxide
E) amphoteric oxide
  • 14. Oxygen is prepared in the laboratory by thermal decomposition of _____
A) potassium trioxonitrate (V)
B) potassium trioxochlorate (V)
C) potassium trioxocarbonate (IV)
D) potassium tetraoxosulphate (VI)
  • 15. What is the role of MnO2 in the thermal decomposition of KClO3 to produce O2? It serves as _____
A) a dehydrating agent
B) an oxidizing agent
C) a catalyst
D) a reducing agent
  • 16. Oxygen is prepared industrially by _____
A) fractional distillation of liquid air
B) hydrolysis of liquid air
C) thermal decomposition of potassium trioxochlorate (V)
D) freezing of liquid air
  • 17. Which of the following is not a physical property of Oxygen?
A) Its atomic number is 8 and mass number is 16
B) It is slightly soluble in water
C) It is a colourless, odourless and tasteless gas
D) It turns blue litmus paper red
  • 18. Which of the following represents a reaction of Oxygen with metals?
A) C + O2 --> CO2
B) 4Na + O2 --> 2Na2O
C) CH4 + 2O2 --> CO2 + 2H2O
D) N2 + 2O2 --> 2NO2
  • 19. The industrial preparation of hydrogen from water gas is called _________
A) Steam Process
B) Bosch Process
C) Haber Process
D) Contact Process
  • 20. Which of the following is not a physical property of hydrogen?
A) It is colourless, odourless and tasteless
B) It is highly inflammable
C) It is slightly soluble in water
D) It turns red litmus paper blue
  • 21. Which of the following is not among the factors affecting equilibrium position of chemical systems?
A) pressure
B) temperature
C) concentration
D) volume
  • 22. According to Le Chatelier's Principle, which of these statements about temperature change is correct?
A) Decreasing the temperature will shift the equilibrium towards the endothermic reaction
B) Increasing the temperature will not affect the position of the equilibrium
C) Increasing the temperature will shift the equilibrium towards the endothermic reaction
D) Increasing the temperature will shift the equilibrium towards the exothermic reaction
  • 23. According to Le Chatelier's Principle, which of these statements about pressure change is correct?
A) Increasing the pressure will shift the equilibrium towards the side with fewer moles of gas.
B) Decreasing the pressure will shift the equilibrium towards the side with fewer moles of gas.
C) Increasing the pressure will shift the equilibrium towards the side with more moles of gas.
D) Increasing the pressure will have no effect on the equilibrium of a gaseous system.
  • 24. The process represented in the equation above is called ______
A) Service Process
B) Haber Process
C) Bosch Process
D) Contact Process
  • 25. Which of these is not among the key conditions for the reaction represented above?
A) Low pressure
B) High pressure
C) Iron catalyst
D) Moderately low temperature
  • 26. Which of the following is not among the properties of solid particles?
A) definite volume
B) definite shape
C) can be compressed
D) very dense
  • 27. Which of the following is not among the properties of liquid particles?
A) less dense
B) no definite shape
C) cannot be compressed
D) no definite volume
  • 28. Which of the following is not among the properties of gas particles?
A) least dense
B) no definite shape
C) cannot be compressed easily
D) fixed mass
  • 29. Boyle's Law states that the volume of a given mass of gas is _____
A) directly proportional to its temperature
B) inversely proportional to its pressure
C) directly proportional to its pressure
D) inversely proportional to its temperature
  • 30. Charles' Law states that the volume of a given mass of gas is _____
A) directly proportional to its pressure
B) directly proportional to its absolute temperature
C) inversely proportional to its pressure
D) inversely proportional to its absolute temperature
  • 31. A sample of gas has a volume of 500cm3 at 450C. What volume will the gas occupy at 00C when the pressure is constant?
A) 442.4cm3
B) 459.2cm3
C) 429.2cm3
D) 432.4cm3
  • 32. The volume of a given mass of gas is 300cm3 at 270C and 700mmHg. What will be its volume at 360C and 750mmHg?
A) 188.4cm3
B) 288.4cm3
C) 388.4cm3
D) 488.4cm3
  • 33. Calculate the volume of 60g of hydrogen chloride HCl gas at s.t.p. [Molar volume of a gas is 22.4dm3, Molar mass of HCl is 36.5g]
A) 27.4dm3
B) 36.8dm3
C) 44.8dm3
D) 18.2dm3
  • 34. Graham's Law of Diffusion states that, at constant and pressure, the rate of diffusion of a gas is ______
A) directly proportional to the square root of its density
B) inversely proportional to the square root of its density
C) directly proportional to its density
D) inversely proportional to its density
  • 35. Which of the following is not true about the similarities between hydrogen and oxygen gases?
A) They both belong to group 1 on the periodic table
B) They are both neutral to litmus paper
C) They are both slightly soluble in water
D) They are both colourless, odourless and tasteless gases
  • 36. The action of steam on red hot iron will produce ___
A) oxygen gas
B) chlorine gas
C) carbon (IV) oxide gas
D) hydrogen gas
  • 37. Liquid oxygen and fuels are used _____
A) for steel production
B) in the manufacture of tetraoxosulphate (VI) acid
C) for medical applicants to help patients breathe
D) as propellants for space rockets
  • 38. Type the name of the organic compound below.

    C8H16
  • 39. Type the name of the organic compound below.

    C8H14
  • 40. When methane is treated with steam in the presence of nickel catalyst at 8000C and 30atm, a mixture of 2 gases known as synthesis gas is formed. Which of these mixtures represents the synthesis gas?
A) CH4 (g) + H2O (g)
B) CH2 (g) + 2H2O (g)
C) CO2 (g) + 3H2 (g)
D) CO (g) + 3H2 (g)
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