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Chemistry MCQs

72 Questions Subject Test
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Atomic StructureChemical BondingReactionsOrganic Chemistry
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61
Hard fpsc Uploaded: 04 Sep 2026

What is the term for the heat required to convert a solid to liquid at its melting point?

  • A Latent heat of vaporization
  • B Heat of combustion
  • C Specific heat capacity
  • D Latent heat of fusion
62
Hard ppsc Uploaded: 04 Sep 2026

What is the term for the lowering of vapor pressure when a non-volatile solute is added to a solvent?

  • A Osmotic pressure
  • B Boiling point elevation
  • C Freezing point depression
  • D Vapor pressure lowering
63
Hard nts Uploaded: 04 Sep 2026

What is Hess's Law used for?

  • A Determining equilibrium constant
  • B Finding molecular geometry
  • C Measuring reaction rate
  • D Calculating enthalpy of reactions indirectly
64
Hard css Uploaded: 04 Sep 2026

Which chemical is commonly used as a disinfectant and has the formula NaOCl?

  • A Sodium hypochlorite
  • B Sodium chloride
  • C Sodium chlorate
  • D Sodium chlorite
65
Hard fpsc Uploaded: 04 Sep 2026

Increasing pressure on a gaseous equilibrium favors the side with:

  • A Fewer moles of gas
  • B Equal moles of gas
  • C More moles of gas
  • D No gas molecules
66
Hard ppsc Uploaded: 06 Aug 2026

Which of the following is used as a catalyst in the Haber process?

  • A Platinum
  • B Iron
  • C Nickel
  • D Copper
67
Hard nts Uploaded: 04 Sep 2026

Which metal is extracted using the electrolytic reduction method due to its high reactivity?

  • A Zinc
  • B Iron
  • C Aluminum
  • D Copper
68
Hard fpsc Uploaded: 06 Aug 2026

What is the standard unit of pressure in chemistry?

  • A Pascal
  • B Newton
  • C Joule
  • D Watt
69
Hard pms Uploaded: 04 Sep 2026

Which of the following is a nonpolar molecule?

  • A Ammonia (NH3)
  • B Carbon dioxide (CO2)
  • C Hydrogen chloride (HCl)
  • D Water (H2O)
70
Hard fpsc Uploaded: 04 Sep 2026

Which metal is used as the standard reference electrode with a potential of 0.00V?

  • A Copper
  • B Silver
  • C Hydrogen
  • D Zinc
71
Hard ppsc Uploaded: 06 Aug 2026

What is the molar mass of water approximately?

  • A 16 g/mol
  • B 20 g/mol
  • C 18 g/mol
  • D 22 g/mol
72
Hard nts Uploaded: 04 Sep 2026

Graham's Law of diffusion relates rate of diffusion to:

  • A Pressure only
  • B Temperature only
  • C Molar mass directly
  • D Square root of molar mass
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