When 10g of 90% pure lime stone is heated completely, the volume (in litres) of CO₂ is liberated at STP is

• 22.4

• 2.24

• 20.16

• 2.016

Which one of the following has unit positive charge and 1 amu mass ?

• Electron

• Neutron

• Proton

• None of these

373.

Law of constant composition is same as the law of

• conservation of mass

• conservation of energy

• multiple proportion

• definite proportion

By dissolving 5 g substance in 50 g of water, the decrease in freezing point is 1.2°C. The gram molal depression is 1.85°C. The molecular weight of substance is :

• 105.4

• 118.2

• 137.2

• 154.2

If molecular weight of KMnO₄ is M, then its equivalent weight in acidic medium would be

• M

• M/2

• M/5

• M/3

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