Please note the following activity given in the book: Take a few zinc granules in a conical flask and add dilute sulphuric acid. Fit the conical flask with a glass tube. Now bring a lighted candle near the upper end of the tube. Hydrogen gas burns with a popping sound. Sir, when I carried out the experiment accordingly, the conical flask turned into pieces with a blast. Please tell me what may be the reason for the blast?

Asked by Manoj | 29th Apr, 2013, 08:28: PM

Expert Answer:

The lighted candle should not be brought near the upper end of the test tube. Hydrogen burns in air explosively so the gas formed in the tube should be passed through a soap solution taken in a trough using a glass delivery tube. Then a lighted candle should be brought near a gas filled soap bubble formed by the bubbling of hydrogen gas in the soap solution. The gas present in the soap bubble burns with a pop sound indicative of the presence of hydrogen gas.

Answered by  | 30th Apr, 2013, 12:32: PM

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