PES SS 2 Chemistry 2nd Term Exam (Obj) 2025/2026
  • 1. Solubility is expressed in ______
A) mol/dm-3
B) mol/dm3
C) dm3
D) g/mol
  • 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) Butane
B) But-2-ene
C) But-2-yne
D) But-1-yne
  • 4. Geometric isomer is common among ____________
A) Alkenes
B) Alkanes
C) Alkanols
D) Alkynes
  • 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) Salt solution
B) Palm oil
C) Baking soda
D) Distilled water
  • 7. Which of the following is not a type of soap?
A) Toilet soap
B) Transparent soap
C) Water soap
D) Hard soap
  • 8. When soap is added to dirty fabric, _____ penetrate greasy dirt.
A) Hydrophobic tails
B) Hydrophilic heads
C) Soap foam
D) Soap molecules
  • 9. ____ remain suspended in water and are rinsed away while washing.
A) Hydrophobic tails
B) Soap molecules
C) Micelles
D) Hydrophilic heads
  • 10. Detergents are made from ____
A) Petroleum hydrocarbons
B) Dried soaps
C) Baking soda
D) Ashes
  • 11. Which of the following is not a use of soap?
A) Emulsifying oils
B) Shampoos
C) Bathing
D) Shaving creams
  • 12. Which of the following is not a use of detergents?
A) Laundry powders
B) Shampoos
C) Shaving creams
D) Dishwashing liquids
  • 13. The mass of an alpha particles is _________
A) 4 units
B) 1/1840 unit
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) 100
B) 1
C) 10
D) 10 000
  • 16. Half-life shows ____ a radioactive substance decays.
A) How much
B) How fast or slow
C) If
D) Why
  • 17. Which of the following is not a halogen?
A) Fluorine
B) Iodine
C) Chlorine
D) Tin
  • 18. Iodine is a____
A) Pale yellow gas
B) Greenish yellow gas
C) Reddish brown liquid
D) Grey crystalline solid
  • 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) Calcium
B) Magnesium
C) Strontium
D) Radium
  • 21. Alkaline earth metals react with acids to release ___________
A) Nitrogen gas
B) Carbon dioxide
C) Hydrogen gas
D) Oxygen gas
  • 22. Transition elements are ____ elements.
A) f-block
B) s-block
C) d-block
D) p-block
  • 23. The following are examples of transition elements except ____
A) Cobalt
B) Rubidium
C) Iron
D) Nickel
  • 24. The general electronic configuration for transition elements is ___________
A) (n-2)d1-10ns0-1
B) 1s2 2s2
C) (n-1)d1-10ns0-2
D) They do not have electronic configuration
  • 25. The following are oxidation states of chromium except ________
A) +6
B) +3
C) -2
D) +2
  • 26. When metals are extracted from ores, they are not usually ____
A) Big
B) Solid
C) Much
D) Pure
  • 27. Which of the following is most abundant in the universe ( ~70% of universe's mass)?
A) Nitrogen
B) Oxygen
C) Carbon
D) Hydrogen
  • 28. Hydrogen burns in oxygen with a ____ flame to form water.
A) Pale blue
B) Orange
C) Red
D) Pale yellow
  • 29. Which of the following reduces metal oxides to metals?
A) Nitrogen
B) Carbon dioxide
C) Hydrogen
D) Water
  • 30. Which of the following reacts slowly with cold water?
A) Hydrogen
B) Carbon
C) Calcium
D) Nitrogen
  • 31. Alkaline earth metals react with hydrogen to form____
A) Hydrogen gas
B) Oxides
C) Oxygen gas
D) Ionic halides
  • 32. Which of the following is used in making ceramics?
A) Barium
B) Magnesium
C) Strontium
D) Aluminium
  • 33. Which for the following can be used for cancer treatment?
A) Radium
B) Chromium
C) Iron
D) Argon
  • 34. Which of the following can be used in making fertilizers?
A) Argon
B) Radium
C) Calcium
D) Iron
  • 35. Which of the following is used in making building materials?
A) Magnesium
B) Argon
C) Calcium
D) Potassium
  • 36. Unstable atoms are called____
A) Particles
B) Nuclei
C) Radioisotopes
D) Rays
  • 37. Which of the following shows a solubility curve with a sharp break at 36oC?
A) Na2SO4
B) NaCl
C) HCl
D) H2SO4
  • 38. Early detergents contained ____ hydrocarbons.
A) Chained
B) Branched
C) Cyclic
D) Straight
  • 39. Modern detergents are made from____ hydrocarbons.
A) Branched
B) Chained
C) Cyclic
D) Linear
  • 40. Soaps are____ biodegradable.
A) Fully
B) Partly
C) Not
D) None of the above
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