What are the most likely questions that come for the exams from the chapter HYDROGEN and ENVIRONMENTAL CHEMISTRY ?

Asked by pksunilnair | 10th Mar, 2017, 06:22: PM

Expert Answer:

All the topics mentioned in the CBSE syllabus are important in exam point of view.
The most important topics from the chapter Hydrogen are: 
  • Position of hydrogn in the periodic table : Justify
  • Isotopes of hydrogen
  • Dihydrogen - Preparation, properties and uses
  • Hydrides, its three types
  • Difference between structures of ice and water
  • Chemical properties of water
  • Hard and soft water - Definition and methods of removal
  • H2O2 - Preparation, structure and properties
  • Use of dihydrogen as an efficient fuel

The most important topics from the chapter Environmental Chemistry are:

Air Pollution

  • Gaseous pollutants (oxides of carbon and oxides of nitrogen)
  • Greenhouse effect
  • Global warning
  • Acid rain
  • Smog
  • Photochemical smog: Definition, formation, adverse effects and effective control
  • Ozone Formation, breakdown, ozone hole, depletion of ozone layer

Water Pollution

  • Causes of water pollution
  • BOD
  • Eutrophication
  • Portable water and international standards of drinking water

Causes of soil pollution

Wastes and its management - Collection and disposal of wastes

Green chemistry 

Answered by Prachi Sawant | 12th Mar, 2017, 06:19: PM