Question

hydrogen and oxygen both help in combustibility bath water whose formula is H2O helps in extinguishing fire why?

Answer 1

combustion equation
H2(g )+ 1/2O2(g) = H2O(L)
you can see the equation,
hydrogen in gas form and oxygen in gas form makes liquid water. There are stong bonding between Hydrogen and oxygen in water. And for combustion they must be in gaseous form.
And water removes heat and used as extenguisher

Answer 2

$\huge\star{\underline{\mathtt{\red{A}\pink{N}\green{S}\blue{W} \purple{E}\orange{R}}}}⋆$

ᴡʜᴇɴ ᴛᴡᴏ ᴇʟᴇᴍᴇɴᴛs ᴄᴏᴍʙɪɴᴇ ᴛᴏ ғᴏʀᴍ ᴀ ᴄᴏᴍᴘᴏᴜɴᴅ, ᴛʜᴇ ᴘʀᴏᴘᴇʀᴛɪᴇs ᴏғ ᴛʜᴇ ᴄᴏᴍᴘᴏᴜɴᴅ ғᴏʀᴍᴇᴅ ᴀʀᴇ ᴅɪғғᴇʀᴇɴᴛ ғʀᴏᴍ ᴛʜᴇ ᴘʀᴏᴘᴇʀᴛɪᴇs ᴏғ ᴘᴀʀᴇɴᴛ ᴇʟᴇᴍᴇɴᴛs. 

ᴛʜᴇʀᴇғᴏʀᴇ, ᴛʜᴏᴜɢʜ ʜʏᴅʀᴏɢᴇɴ ɪs ᴄᴏᴍʙᴜsᴛɪʙʟᴇ & ᴏxʏɢᴇɴ ʜᴇʟᴘs ᴄᴏᴍʙᴜsᴛɪᴏɴ, ᴛʜᴇ ᴡᴀᴛᴇʀ ʜᴇʟᴘs ᴛᴏ ᴇxᴛɪɴɢᴜɪsʜ ᴛʜᴇ ғɪʀᴇ. ʜᴇʀᴇ, ʜʏᴅʀᴏɢᴇɴ ᴀɴᴅ ᴏxʏɢᴇɴ ʜᴇʟᴘ ᴄᴏᴍʙᴜsᴛɪᴏɴ ʙᴜᴛ ᴛʜᴇɪʀ ᴄᴏᴍᴘᴏᴜɴᴅ ʀᴇᴅᴜᴄᴇs ᴄᴏᴍʙᴜsᴛɪᴏɴ.