Question

How will you test a gas for Hydrogen, Oxygen and carbon dioxide?
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Answer 1

Explanation:

Place a burning splint near the opening of a test tube. If a popping noise occurs, it's probably hydrogen. Place a glowing splint in the test tube, and if it reignites, it could be oxygen. Place a burning splint into a test tube, and if it goes out, it could be carbon dioxide.

Answer 2

${\sf{\underline{\blue{Answer :}}}}$

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「ᴀ sᴘʟɪɴᴛ ɪs ʟɪᴛ ᴀɴᴅ ʜᴇʟᴅ ɴᴇᴀʀ ᴛʜᴇ ᴏᴘᴇɴɪɴɢ ᴏғ ᴛʜᴇ ᴛᴜʙᴇ, ᴛʜᴇɴ ᴛʜᴇ sᴛᴏᴘᴘᴇʀ ɪs ʀᴇᴍᴏᴠᴇᴅ ᴛᴏ ᴇxᴘᴏsᴇ ᴛʜᴇ sᴘʟɪɴᴛ ᴛᴏ ᴛʜᴇ ɢᴀs. ɪғ ᴛʜᴇ ɢᴀs ɪs ғʟᴀᴍᴍᴀʙʟᴇ, ᴛʜᴇ ᴍɪxᴛᴜʀᴇ ɪɢɴɪᴛᴇs. ᴛʜɪs ᴛᴇsᴛ ɪs ᴍᴏsᴛ ᴄᴏᴍᴍᴏɴʟʏ ᴜsᴇᴅ ᴛᴏ ɪᴅᴇɴᴛɪғʏ ʜʏᴅʀᴏɢᴇɴ, ᴡʜɪᴄʜ ᴇxᴛɪɴɢᴜɪsʜᴇs ᴡɪᴛʜ ᴀ ᴅɪsᴛɪɴᴄᴛɪᴠᴇ 'sǫᴜᴇᴀᴋʏ ᴘᴏᴘ' sᴏᴜɴᴅ.」♡

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Hope its help uhh :)