Question

Temporary hardness and permanent hardness in water can be removed respectively by the addition of
a) CaO and Na2CO3 b) CaO and CaCO3
c) Na2CO3 and CaCl2 d) NaHCO3 and CaO

Answer 1

Explanation:

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ᴛᴇᴍᴘᴏʀᴀʀʏ ʜᴀʀᴅɴᴇꜱꜱ ᴄᴀɴ ʙᴇ ʀᴇᴍᴏᴠᴇᴅ ʙʏ ʙᴏɪʟɪɴɢ ᴏʀ ʙʏ ᴀᴅᴅɪᴛɪᴏɴ ᴏꜰ ᴄᴀ(ᴏʜ)2. ᴘᴇʀᴍᴀɴᴇɴᴛ ʜᴀʀᴅɴᴇꜱꜱ ᴄᴀɴ ʙᴇ ʀᴇᴍᴏᴠᴇᴅ ʙʏ ᴛʜᴇ ᴀᴅᴅɪᴛɪᴏɴ ᴏꜰ ᴡᴀꜱʜɪɴɢ ꜱᴏᴅᴀ (ɴᴀ2ᴄᴏ3. 10ʜ2ᴏ), ᴀᴅᴅɪᴛɪᴏɴ ᴏꜰ ꜱᴏᴅɪᴜᴍ ᴘᴏʟʏᴍᴇᴛᴀᴘʜᴏꜱᴘʜᴀᴛᴇ [ᴄᴀʟɢᴏɴ (ɴᴀᴘᴏ3)ɴ ] ᴏʀ ʙʏ ɪᴏɴ ᴇxᴄʜᴀɴɢᴇ ᴍᴇᴛʜᴏᴅ).

Answer 2

Answer:

ᴛᴇᴍᴘᴏʀᴀʀʏ ʜᴀʀᴅɴᴇꜱꜱ ᴄᴀɴ ʙᴇ ʀᴇᴍᴏᴠᴇᴅ ʙʏ ʙᴏɪʟɪɴɢ ᴏʀ ʙʏ ᴀᴅᴅɪᴛɪᴏɴ ᴏꜰ ᴄᴀ(ᴏʜ)2. ᴘᴇʀᴍᴀɴᴇɴᴛ ʜᴀʀᴅɴᴇꜱꜱ ᴄᴀɴ ʙᴇ ʀᴇᴍᴏᴠᴇᴅ ʙʏ ᴛʜᴇ ᴀᴅᴅɪᴛɪᴏɴ ᴏꜰ ᴡᴀꜱʜɪɴɢ ꜱᴏᴅᴀ (ɴᴀ2ᴄᴏ3. 10ʜ2ᴏ), ᴀᴅᴅɪᴛɪᴏɴ ᴏꜰ ꜱᴏᴅɪᴜᴍ ᴘᴏʟʏᴍᴇᴛᴀᴘʜᴏꜱᴘʜᴀᴛᴇ [ᴄᴀʟɢᴏɴ (ɴᴀᴘᴏ3)ɴ ] ᴏʀ ʙʏ ɪᴏɴ ᴇxᴄʜᴀɴɢᴇ ᴍᴇᴛʜᴏᴅ).

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