PES SS 2 Chemistry 2nd Term Exam (Obj) 2025/2026
  • 1. Solubility is expressed in ______
A) mol/dm3
B) mol/dm-3
C) g/mol
D) dm3
  • 2. A solubility curve shows _____
A) The variation of solubility of a substance with temperature
B) The way a solute dissolves
C) How much substance is dissolved
D) The variation of solubility of a substance with volume
  • 3. Which of the following has two geometric isomers?
A) Butane
B) But-2-yne
C) But-2-ene
D) But-1-yne
  • 4. Geometric isomer is common among ____________
A) Alkynes
B) Alkanols
C) Alkenes
D) Alkanes
  • 5. The molecular formula for glycerol is____
A) C2H4
B) RCOONa
C) C3H5(OOCR)_3
D) C3H5(OH)_3
  • 6. Which of the following is not needed in the laboratory preparation of soap?
A) Distilled water
B) Salt solution
C) Palm oil
D) Baking soda
  • 7. Which of the following is not a type of soap?
A) Transparent soap
B) Toilet soap
C) Hard soap
D) Water soap
  • 8. When soap is added to dirty fabric, _____ penetrate greasy dirt.
A) Soap foam
B) Soap molecules
C) Hydrophobic tails
D) Hydrophilic heads
  • 9. ____ remain suspended in water and are rinsed away while washing.
A) Soap molecules
B) Hydrophobic tails
C) Hydrophilic heads
D) Micelles
  • 10. Detergents are made from ____
A) Petroleum hydrocarbons
B) Ashes
C) Dried soaps
D) Baking soda
  • 11. Which of the following is not a use of soap?
A) Shaving creams
B) Emulsifying oils
C) Bathing
D) Shampoos
  • 12. Which of the following is not a use of detergents?
A) Laundry powders
B) Shaving creams
C) Dishwashing liquids
D) Shampoos
  • 13. The mass of an alpha particles is _________
A) 1/1840 unit
B) No mass
C) 4 units
D) 6 units
  • 14. The electrical charge on beta particles is ________
A) +1
B) -1
C) It has no charge.
D) +2
  • 15. The relative penetration of gamma rays is __________
A) 10
B) 1
C) 100
D) 10 000
  • 16. Half-life shows ____ a radioactive substance decays.
A) How fast or slow
B) Why
C) If
D) How much
  • 17. Which of the following is not a halogen?
A) Tin
B) Fluorine
C) Iodine
D) Chlorine
  • 18. Iodine is a____
A) Grey crystalline solid
B) Reddish brown liquid
C) Pale yellow gas
D) Greenish yellow gas
  • 19. Alkali metals react with oxygen to produce ____
A) Oxygen gas
B) Oxides, peroxides, superoxides.
C) Hydrogen gas
D) Trioxonitrates
  • 20. Which of the following can be used in producing red fireworks?
A) Radium
B) Magnesium
C) Calcium
D) Strontium
  • 21. Alkaline earth metals react with acids to release ___________
A) Hydrogen gas
B) Nitrogen gas
C) Carbon dioxide
D) Oxygen gas
  • 22. Transition elements are ____ elements.
A) f-block
B) s-block
C) p-block
D) d-block
  • 23. The following are examples of transition elements except ____
A) Rubidium
B) Iron
C) Cobalt
D) Nickel
  • 24. The general electronic configuration for transition elements is ___________
A) (n-2)d1-10ns0-1
B) They do not have electronic configuration
C) (n-1)d1-10ns0-2
D) 1s2 2s2
  • 25. The following are oxidation states of chromium except ________
A) +3
B) +2
C) +6
D) -2
  • 26. When metals are extracted from ores, they are not usually ____
A) Pure
B) Solid
C) Big
D) Much
  • 27. Which of the following is most abundant in the universe ( ~70% of universe's mass)?
A) Hydrogen
B) Nitrogen
C) Oxygen
D) Carbon
  • 28. Hydrogen burns in oxygen with a ____ flame to form water.
A) Orange
B) Pale yellow
C) Red
D) Pale blue
  • 29. Which of the following reduces metal oxides to metals?
A) Nitrogen
B) Hydrogen
C) Water
D) Carbon dioxide
  • 30. Which of the following reacts slowly with cold water?
A) Nitrogen
B) Calcium
C) Hydrogen
D) Carbon
  • 31. Alkaline earth metals react with hydrogen to form____
A) Ionic halides
B) Oxides
C) Oxygen gas
D) Hydrogen gas
  • 32. Which of the following is used in making ceramics?
A) Barium
B) Aluminium
C) Strontium
D) Magnesium
  • 33. Which for the following can be used for cancer treatment?
A) Argon
B) Iron
C) Radium
D) Chromium
  • 34. Which of the following can be used in making fertilizers?
A) Iron
B) Calcium
C) Argon
D) Radium
  • 35. Which of the following is used in making building materials?
A) Magnesium
B) Argon
C) Potassium
D) Calcium
  • 36. Unstable atoms are called____
A) Rays
B) Radioisotopes
C) Particles
D) Nuclei
  • 37. Which of the following shows a solubility curve with a sharp break at 36oC?
A) Na2SO4
B) NaCl
C) H2SO4
D) HCl
  • 38. Early detergents contained ____ hydrocarbons.
A) Chained
B) Cyclic
C) Branched
D) Straight
  • 39. Modern detergents are made from____ hydrocarbons.
A) Chained
B) Branched
C) Linear
D) Cyclic
  • 40. Soaps are____ biodegradable.
A) None of the above
B) Not
C) Fully
D) Partly
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