Question

laboratory preparation of hydrogen and its precautions

Answer 1

Dangerous heat and chemical reaction may result from incorrect operation of hydrogen generators.  Removing a hydrogen generator from a water tank while in operation will produce excessive heat and may cause a dangerous chemical reaction.   Never remove a generator from the water while in operation until the generation of hydrogen gas has stopped.

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Answer 2

take dilute hydrogen sulphate / sulfuric acid in flask and add a few pieces of granulated zinc now immediately at the opening of the funnel attach a flying jatt fixed on a cork in reaction between sulfuric acid and zinc hydrogen gas is liberated now bring a burning splinter near the mouth of fine jet a Pop sound is observed that was hydrogen gas combustion now for the precaution use a cork handle handle the sulphuric acid carefully hydrogen gas is highly combustible so use of fine jet