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Chemistry formula for class 11 chapter- Hydrogen

Chemistry Formulas

Class 11 chapter- Hydrogen

  • Isotopes of hydrogen are protium (21H); Deuterium (21H) or (21D) and tritium (31H) or (31T).
  • 31T (Tritium) is radioactive and has a half life period of 12.26 years.
  • A mixture of CO and H2 is known as water gas. It is also called as synthesis gas (or) syn gas.
  • Coal gas contains hydrogen (45 – 55%) ; methane (25 – 35%) and carbon monoxide (4 – 11%).
  • Its calorific value is 21,000 Kjm–3
  • The composition of water gas is carbon monoxide (40 – 50%); hydrogen (45 – 50%) and small amounts of CO2 and N2. Its calorific value is 13,000 KJm–3.
  • Semi water gas composition is H2 (10 – 20%), CO (25 – 28%), CO2 (4 – 5)%, N2 (50 – 55%) and CH4 (1 – 12%). Its calorific value is 7524 KJm–3.
  • Fuel cells- Electro chemical cells in which chemical energy released in a combustion reaction is converted into electrical energy.
  • The temporary hardness of water is due to the presence of bicarbonates of calcium and magnesium.
  • The permanent hardness of water is due to the presence of chlorides and sulphates of calcium and magnesium.
  • Permanent hardness of water is removed by
  1. Permutit process
  2. Calgon process
  3. Ion exchange method.
  • Permutit is artificial Zeolite, Zeolite is hydrated sodium aluminium orthosilicate (Na2Al2Si2O8, nH2O)
  • Exhausted permut it can be regenerated by washing it with 10% aqueous brine solution.
  • Calgon is sodium hexa meta phosphate. Na2[Na4(PO3)6] (or) (NaPO3)6
  • The number of parts by weight of calcium carbonate present in million parts by weight of water is known as the degree of hardness of water.
  • The degree of hardness of water is expressed in terms of ppm oc CaCO3
  • D2O is heavy water. I part in 6000 parts of ordinary water.
  • H2O2 is also known as oxygenated water.
  • 30% (w/v) aqueous solution of hydrogen peroxide is known as perhydrol.
  • H2O2 is prepared by electrolysis of 50%. H2SO4. At cathode H2 and at anode H2S2O8.

H2S2O8 + 2H2O →2H2SO4 + H2O2.k

This chemistry formula sheet for Hydrogen is highly recommended for the quick revision of the entire chapter-Hydrogen. 

Download free pdf sheet which consist of formulas and important points of Hydrogen from the link given below . 

Chemistry formula for class 11 chapter- Hydrogen

Chemistry formula for class 11 chapter- Hydrogen

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