write down the laboratory prepairation of hydrogen with its precautions and test
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The laboratory preparation of hydrogen gas usually involves the action of dilute sulphuric acid or dilute hydrochloric acid on zinc granules.
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Precautions in laboratory preparation of hydrogen gas.
Apparatus should be use tight.
Allow the first few bubbles of hydrogen gas to escape, as they not only contain air, but also form an explosive mixture.
Don't bring any naked flame near the apparatus.
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