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