Sulphurous acid turns blue litmus paper into..
Neutral
No change in litmus paper.
Blue
Red
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ʜᴏʟᴀ♥
Sulphurous acid turns blue litmus paper into red.
ʜᴏᴘᴇ ᴛʜɪs ʜᴇʟᴘs◉‿◉
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ꜱᴜʟᴘʜᴜʀᴏᴜꜱ ᴀᴄɪᴅ ᴛᴜʀɴꜱ ʙʟᴜᴇ ʟɪᴛᴍᴜꜱ ᴘᴀᴘᴇʀ ɪɴᴛᴏ ʀᴇᴅ.
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