Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

Chemistry Class 11

Created by: Mohit Rajpoot

Class 11 : Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

The document Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev is a part of the Class 11 Course Chemistry Class 11.
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Physical Properties of Dihydrogen

Dihydrogen is a colourless, odourless, tasteless, combustible gas. It is lighter than air and insoluble in water. It is neutral to litmus.


Chemical Properties of Dihydrogen:

(i) Reactivity: The relative inertness of dihydrogen at room temperature is because of its high enthalpy of H-H bond i.e. high bond dissociation energy. So, its reactions take place under specific conditions only (at high temperature).

(ii) Action with non-metals:

Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

  Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

(iii) Reaction with metals: Here H2 acts as oxidizing agent.

Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

(iv) Reducing action of dihydrogen:

Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

(v) Reactions with metal ions and metal oxides:

Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

(vi) Reaction with organic compounds:

Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev

Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev


Uses of Dihydrogen:

  1. It is used in the manufacture of CH3OH. 
    Physical and Chemical Properties of Dihydrogen Class 11 Notes | EduRev
  2. It produces temperature of 2850°C and oxy-atomic hydrogen flame produces a temperature of 4000°C, so it is used in oxy-hydrogen flame.
  3. The largest single use of H2 is in the synthesis of NH3 which is used in the manufacture of HNO3 and fertilizers.
  4. Liquid hydrogen (H2) is used as rocket fuel.
  5. H2 is used as a reducing agent in extraction of metals.
  6. H2 is used in fuel cell for generating electrical energy.
  7. Hydrogen is used in the manufacture of synthetic petrol.

(By heating H2 with coal and heavy oils under very high pressure in the presence of catalyst.)

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