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|[http://ncert.nic.in/NCERTS/textbook/textbook.htm?jesc1=1-16  Chemical Reactions and Equations]
 
|[http://ncert.nic.in/NCERTS/textbook/textbook.htm?jesc1=1-16  Chemical Reactions and Equations]
 
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|[http://ncert.nic.in/NCERTS/textbook/textbook.htm?hesc1=2-18  Micro-organisms:Friend and Foe]
 
|[http://ncert.nic.in/NCERTS/textbook/textbook.htm?hesc1=2-18  Micro-organisms:Friend and Foe]
 
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