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Answer:
Q.7 In the Haber process, nitrogen and hydrogen react together under these conditions: a high temperature – ranging from 350°C to 450°C. a high pressure – ranging from 150 to 200 atmospheres (150 – 200 times normal pressure)
Q.8 Hydrogen is a clean fuel that, when consumed in a fuel cell, produces only water, electricity, and heat. Due to their high efficiency and zero-or near zero-emissions operation, hydrogen and fuel cells have the potential to reduce greenhouse gas emission in many applications
Q.9Hydrogen is a inflammable gas and sets fire very easily. Highly combustible gas and may cause severe hazard. So filling the balloons with hydrogen gas is highly unsafe. Therefore, we prefer helium gas instead of hydrogen gas to fill weather balloons
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