Question

It is difficult to use hydrogen as a source of energy, although its calorific value is quite high.
Explain.

Answer 1

this is because

=> it burns with an explosion..So ,it's use is very much unsafe.

=>It is very expensive to produce hydrogen from electrolysis of water.

=>It is very difficult to store and transport hydrogen because it is explosively inflamable.

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Answer 2

it is difficult to use hydrogen as a source of energy because it is highly inflammable and it's cost is very expensive! that's why..