Question

(ü) Explain why solid lithium iodide does not conduct electricity but when molten it is a good
conductor​

Answer 1

$Answer$

ᴇʟᴇᴄᴛʀɪᴄᴀʟ ᴄᴏɴᴅᴜᴄᴛɪᴠɪᴛʏ ʀᴇǫᴜɪʀᴇs ᴛʜᴇ ᴍᴏᴠᴇᴍᴇɴᴛ ᴏғ ᴄʜᴀʀɢᴇᴅ ᴘᴀʀᴛɪᴄʟᴇs. ᴛʜᴇ ᴄᴏᴍᴍᴏɴ ᴜɴɪᴛ ғᴏʀ ᴄʜᴀʀɢᴇ ɪs ᴛʜᴇ ᴄᴏᴜʟᴏᴍʙ ( ᴄ ). ... ᴀ sᴏʟɪᴅ ɪᴏɴɪᴄ ᴄᴏᴍᴘᴏᴜɴᴅ ᴅᴏᴇs ɴᴏᴛ ᴄᴏɴᴅᴜᴄᴛ ᴇʟᴇᴄᴛʀɪᴄɪᴛʏ ʙᴇᴄᴀᴜsᴇ ᴛʜᴇ ɪᴏɴs ᴀʀᴇ ɴᴏᴛғʀᴇᴇ ᴛᴏ ᴍᴏᴠᴇ.

Answer 2

Solid lithium iodide does not conduct electricity but when molten it is a good conductor. The following are some reason

• Solid lithium iodide is held by a strong ionic bond, so it can not move around. Since there are no free ions and electrons to conduct electricity. Therefore, they are not a good conductor of electricity.
• But in molten form, the ion and electron are free, so they can move freely. They have become mobile ions. These mobile ions facilitate conductance. So lithium iodide is an excellent electrolyte and can conduct electricity.
• Therefore, solid lithium iodide does not conduct electricity but molten Lithium chloride is a good conductor.