Answers
Actually, there's nothing wrong with preparing hydrogen gas using concentrated sulphuric acid.
Explanation:
My guess about your problem is that the sulphuric acid used in your laboratory is under a highly controlled but sealed environment, hence hydrogen gas may easily be produced in unpredictable quantities, increasing the chances of explosive events.
The problem actually lies in producing sulphuric acid.
When sulphuric acid is used in industrial chemistry, large amounts of hydrogen gas can be produced as one of the byproducts especially when purifying metals or other compounds that result in rapid release of hydrogen gas.
Factories have guidelines on having a threshold or limit when it comes to using concentrated sulphuric acid because the hydrogen gas that is produced can very easily build up to explosive levels without anyone noticing.
Finally, no matter what you're preparing, hydrogen gas or not, concentrated sulphuric acid is dangerous anyway, so be careful all the time.
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