ICSE Class 9: Preparation of Hydrogen Videos | Study of First Element - Hydrogen

• In the preparation of hydrogen in the laboratory, the end of the thistle funnel in the flask should be dipped in the acid. Why?
• how we can prepare hydrogen by sodium
• what do u mean by vegurosluly
• state some sources of hydrogen
• Why hydrogen is not collected by downward displacment of air??
• plz. ans. this
  
• We not prefer Iron for the preparation of hydrogen gas because impurities are present but zinc also contains impurities than why do we prefer that element?
• Why do we collect the hydrogen gas by downward displacement of water?  Why not by air? 
•  which of the following reaction can give hydrogen gas. (1)Zn + conc.H2SO4 (2)Cu + dil. H2SO4 (3)Mn + very dilute HNO3 (4)pb + dil HNO3   Plzzzz explain all options....Thanks!!
• Hydrogen can be prepared with the metal zinc by using a.acid b.alkali c.water  

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