Some Basic Concepts of Chemistry

The volume of oxygen necessary for the complete combustion of 20 L of propane is :

• 40 L

• 60 L

• 80 L

• 100 L

A gaseous mixture contains 56 g of N₂, 44 g of CO₂ and 16 g of CH₄. The total pressure of mixture is 720 mm of Hg. The partial pressure of methane is :

• 75 atm

• 160 atm

• 180 atm

• 215 atm

20 volume H₂O₂ solution has a strenght of about

• 30%

• 6%

• 3%

• 10%

74.5 g of a metallic chloride contains 35.5 g of chlorine, the  quivalent weight of the metal is

• 19.5

• 35.5

• 39

• 78.0