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PES SS 1 Chemistry 3rd Term Exam 2024-2025
  • 1. What type of reaction does the following equation represent? H3O+ OH- --> 2H2O
A) oxidation
B) neutralisation
C) reduction
D) hydrolysis
Chemistry
  • 2. The oxidation number of Y the formula above is ____
A) -7
B) +7
C) +6
D) -6
  • 3. Which statement best describes the process of reduction?
A) removal of electrons
B) addition of hydrogen
C) increase in oxidation number
D) addition of oxygen
Chemistry
  • 4. The oxidation number of Z the formula above is ____
A) +2
B) -2
C) +4
D) -4
  • 5. What is the oxidation number of Manganese in KMnO4?
A) +6
B) -7
C) +7
D) -6
  • 6. Name this compound. KMnO4
A) Potassium tetraoxomanganate (V)
B) Potassium hexaoxomanganate (IV)
C) Potassium hexaoxomanganate (VI)
D) Potassium tetraoxomanganate (VII)
  • 7. What is the oxidation number of Chromium in K2Cr2O7?
A) -7
B) -6
C) +7
D) +6
  • 8. What is the oxidation number of S in SO4-2?
A) -8
B) +6
C) +8
D) -6
  • 9. Which of the following is not a transition metal?
A) Ag
B) Na
C) Fe
D) Cu
  • 10. Which of the following is not an alkali metal?
A) K
B) Li
C) Na
D) Mg
  • 11. What is the chemical formula of Sodium chloride?
A) SCl
B) Na2Cl
C) NaCl
D) SCl2
  • 12. Which of the following indicates oxidation?
A) Removal of Oxygen
B) Addition of hydrogen
C) Addition of electrons
D) Removal of electrons
  • 13. Which of the following does not indicate reduction?
A) Removal of Oxygen
B) Addition of electrons
C) Addition of hydrogen
D) Removal of electrons
Chemistry
  • 14. What does x represent?
A) -1
B) +3
C) +5
D) -3
  • 15. What type of reaction is represented here? AB +CD --> AD + CB
A) Thermal dissociation
B) Displacement
C) Catalytic
D) Double decomposition
  • 16. What is the name of this compound? HNO3
A) Trioxonitrate (VI) acid
B) Trioxonitrate (III) acid
C) Trioxonitrate (V) acid
D) Trioxonitrate (IV) acid
  • 17. Neutralization is the reaction between ________ and ___________
A) an acid and a salt
B) an acid and a base
C) a base and a salt
D) a salt and water
  • 18. Ammonium Chloride is written as __________
A) (NH4)_2Cl2
B) (NH4)_2Cl
C) NH4Cl2
D) NH4Cl
  • 19. Which element has the atomic number 7?
A) Nitrogen
B) Fluorine
C) Carbon
D) Oxygen
  • 20. Which of the following is the correct way to write Aluminium trioxocarbonate (IV)?
A) Al3(CO3)_2
B) Al(CO3)_3
C) Al(CO3)
D) Al2(CO3)_3
  • 21. At constant volume, the pressure of a gas is directly proportional to the temperature in Kelvin. This is the statement of _________
A) Boyle's Law
B) Avogadro's Law
C) Charles' Law
D) Gay-Lusaac's Law
  • 22. What are amphoteric oxides?
A) Non-metallic oxides that exhibit both acidic and basic properties
B) Metallic oxides that exhibit both physical and chemical properties
C) Non-metallic oxides that exhibit both physical and chemical properties
D) Metallic oxides that exhibit both acidic and basic properties
  • 23. Which of the following is the correct way to write Potassium trioxonitrate (V)?
A) K(NO3)_2
B) KNO3
C) K2(NO3)_3
D) K2NO3
  • 24. Which of the following is not an alkaline earth metal?
A) Be
B) Mg
C) Ca
D) Na
Chemistry
  • 25. Which of the following is oxidation?
A) b
B) c
C) d
D) a
Chemistry
  • 26. Which of the following is reduction?
A) c
B) d
C) b
D) a
Chemistry
  • 27. The reaction shown here is an example of ____________
A) Thermal dissociation
B) Combination
C) Displacement
D) Decomposition
Chemistry
  • 28. The reaction shown here is an example of ____________
A) Catalytic
B) Combination
C) Displacement
D) Decomposition
  • 29. The chemical symbol of Sodium is ___
  • 30. The chemical symbol of Potassium is ___
  • 31. The chemical symbol of Magnesium is ___
  • 32. The chemical symbol of Nitrogen is ___
  • 33. The chemical symbol of Copper is ___
  • 34. The chemical symbol of Manganese is ___
  • 35. The chemical symbol of Iron is ___
  • 36. The existence in the same physical state of two or more structural forms of the same element is known as ____
A) isotopy
B) hybridization
C) eclipse
D) allotropy
  • 37. Which groups are known as halogens?
A) group 9
B) group 5
C) group 8
D) group 7
  • 38. Calculate the molar mass of Potassium chloride (k=39, Cl=35.5)
A) 74gmol-1
B) 58.5gmol-1
C) 74.5gmol-1
D) 47gmol-1
  • 39. _____is a process of preventing iron from rusting by protecting it with other metals like copper, tin, gold and silver
A) Greasing
B) Painting
C) Electroplating
D) Oiling
  • 40. The symbol of silver is written as
A) Al
B) Au
C) Si
D) Ag
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