2. Why Na Cl is not sublimable substance ?
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sᴏᴅɪᴜᴍ ᴄʜʟᴏʀɪᴅᴇ ɪs ᴀɴ ɪᴏɴɪᴄ sᴏʟɪᴅ ᴀɴᴅ ʜᴀs ʜɪɢʜ ᴍᴇʟᴛɪɴɢ ᴀɴᴅ ʙᴏɪʟɪɴɢ ᴘᴏɪɴᴛs. sᴏ ɪᴛ ᴄᴀɴ ɴᴏᴛ ᴄʜᴀɴɢᴇ ɪɴ ᴠᴀᴘᴏᴜʀ ᴘʜᴀsᴇ sɪᴍᴘʟʏ ᴀᴛ ᴀᴛᴍᴏsᴘʜᴇʀɪᴄ ᴘʀᴇssᴜʀᴇ ʜᴇɴᴄᴇ ɪᴛ ᴄᴀɴɴᴏᴛ sᴜʙʟɪᴍᴇ. ᴀᴍᴍᴏɴɪᴜᴍ ᴄʜʟᴏʀɪᴅᴇ, ᴅʀʏ ɪᴄᴇ ᴀɴᴅ ɪᴏᴅɪɴᴇ ᴜɴᴅᴇʀɢᴏ sᴜʙʟɪᴍᴀᴛɪᴏɴ ᴡʜɪᴄʜ ᴏɴ ʜᴇᴀᴛɪɴɢ ᴡɪᴛʜᴏᴜᴛ ᴄᴏᴍɪɴɢ ɪɴ ᴛʜᴇ ʟɪǫᴜɪᴅ sᴛᴀᴛᴇ ᴅɪʀᴇᴄᴛʟʏ ᴄᴏɴᴠᴇʀᴛ ɪɴ ᴀ ɢᴀsᴇᴏᴜs sᴛᴀᴛᴇ.❣️
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Answer:
Sodium Chloride is an ionic solid and has high melting and boiling points. So it can not change in vapour phase simply at atmospheric pressure hence it cannot sublime.
Ammonium chloride, dry ice and iodine undergo sublimation which on heating without coming in the liquid state directly convert in a gaseous state.
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