CHEMISTRY SECOND TERM EXAMINATION 2022/2023 SESSION

Convert 300K to Celsius scale   

• 573⁰C

• 273⁰C

• 57⁰C

• 27⁰C

Mixture can be separated by _____ methods      

• physical

• chemical

• special

• permanent

At constant temperature, the volume of a given mass of a gas is _____ proportional to its pressure  

• directly

• inversely

• immediately

• doubly

Which of these is compressible?  

• liquid

• gas

• solid

• none of the above

The average kinetic energy of gas molecule is proportional to its ______      

• amount of moles

• pressure

• volume

• absolute temperature

To what temperature must a gas at 273K be heated in order to double its volume and pressure?   

• 546K

• 298K

• 819K

• 1092K

Equal volumes of all gases at the same temperature and pressure contain the same number of molecules. This law is that of _____    

• Graham’s law of diffusion  

• Avogadro’s law

• Gay Lussac’s law

• Dalton’s law of partial pressure

The S.I. unit of pressure is ____      

• Nm^-2

• Nm²

• Nm^-3

• Nm^-3

  Arrange these  gases; H, He, CH₄, N₂ in order of increasing rates of diffusion (H = 1, C = 12, He = 4, N = 14)     

• H, He, CH₄, N₂

• He, H, CH₄, N₂

• CH₄, H, N₂, He

• H, N₂, He, CH₄

Boyle’s law has its application in all of these EXCEPT one      

• diving

• filling of balloon

• breathing

• boiling of water