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Study of the First Element - Hydrogen — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYStudy of the First Element - Hydrogen1 Mark
Question
Which test should be made before collecting hydrogen in a gas jar?
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Answer

Test: Collect some amount of gas in a test tube and take it to a flame.
If the gas burns quietly, then there is no more air in the flask.

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