Answers

2015-09-11T21:09:10+05:30
Because
1.high cost for production
2.cost for storage
3.flammability hazard
4.oxygen depletion  
0
2015-09-12T10:21:10+05:30
Calorific value is highest in hydrogen. It is also used in fuel especially rocket fuel which is mixture of liguid oxygen and hydrogen
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