The   partial  pressure of hydrogen is 0.31  atm
calculation
find the number of  hydrogen   moles the container, that is
25/100  x 6.4  =1.6 moles of hydrogen
find the  partial pressure for hydrogen  in 1.6 moles
that is   6.4  moles=  1.24 atm
            1.6  moles= ?
by  cross  multiplication
1.6moles  x1.24  atm/ 6.4 moles=  0.31 atm
        
             
        
        
        
Answer:
Hydrogen is the most explosive element 
 
        
                    
             
        
        
        
The following is the introduction to a special e-publication called Determining the Age of the Earth (click the link to see a table of contents). Published earlier this year, the collection draws articles from the archives of Scientific American. In the collection, this introduction appears with the title, “Stumbling Toward an Understanding of Geologic Timescales.”
 
        
             
        
        
        
Water is an essential part of life and its availability is important for all living creatures. On the other side, the world is suffering from a major problem of drinking water. There are several gases, microorganisms and other toxins (chemicals and heavy metals) added into water during rain, flowing water, etc. which is responsible for water pollution. This review article describes various applications of nanomaterial in removing different types of impurities from polluted water. There are various kinds of nanomaterials, which carried huge potential to treat polluted water (containing metal toxin substance, different organic and inorganic impurities) very effectively due to their unique properties like greater surface area, able to work at low concentration, etc. The nanostructured catalytic membranes, nanosorbents and nanophotocatalyst based approaches to remove pollutants from wastewater are eco-friendly and efficient, but they require more energy, more investment in order to purify the wastewater. There are many challenges and issues of wastewater treatment. Some precautions are also required to keep away from ecological and health issues. New modern equipment for wastewater treatment should be flexible, low cost and efficient for the commercialization purpose.
 
        
             
        
        
        
Answer:
Only white phosphorus is stored under water. White phosphorus spontaneously reacts with oxygen in the air to burst into flame to form phosphorus pentoxide 
Explanation: