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
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%
B.
6%
20 volumes of H2O2 means 20 L of oxygen is obtained at STP by the decomposition of 1L H2O2 solution
22.4 L oxygen is obtained from 68g H2O2.
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