PHYSICAL PROPERTIES OF HYDROGEN AND USES OF HYDROGEN
 
PHYSICAL PROPERTIES OF HYDROGEN
 
At room temperature hydrogen is a gas.
It is a colorless, tasteless and odorless gas.
It is the lightest gas.
It is insoluble in water.
It is highly inflammable and burns with blue flame forming water.
Liquefication temperature of hydrogen is -252oC.
Bond energy of H-H is 431 Kj/mole.
Electro negativity of hydrogen is 2.1.
Ionization potential of hydrogen gas is 13.54 electron volt.
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USES OF HYDROGEN
 
It is used as a fuel.
It is used for the manufacturing of fertilizers.
It is used in the preparation of vegetable ghee.
It is used as rocket fuel.
It is used in the preparation of ammonia (NH3) and methanol (CH3OH).
It is used in the preparation of oxy-hydrogen flame which is used in welding due to production of high temperature.
It is used in filling weather balloons.
It is used to prepare tungsten filament.
It is used to prepare low temperature in liquid state.
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Question: Write the chemical formula of the following:
Baking soda: NaHCO3 (Sodium bicarbonate)
Washing soda: Na2CO3.10H2O (Hydrous sodium carbonate)
Caustic soda: NaOH (Sodium hydroxide)
Slaked lime: Ca(OH)2
Quick lime: CaO
Lime stone: CaCO3
Dolomite: CaCO3.MgCO3
Gypsum: CaSO4.2H2O
Epsomite (EPSOM SALT): MgSO4
Magnesite: MgCO3
Plaster of paris: CaSO4.1/2H2O
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