Name a gas other than hydrogen collected by downward displacement of water
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ᴏxʏɢᴇɴ ɪs ᴏʙᴛᴀɪɴᴇᴅ ᴡɪᴛʜ ᴛʜᴇ ʜʏᴅʀᴏɢᴇɴ
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