Question

mention three points to justify that air is a mixture not a compound

Answer 1

1. It shows properties of its constituents i.e. it shows properties of all its gases.
2. It can be separated into its constituents by physical method of fractional distillation.
3. It does have a fixed composition.
4. Liquid air does not have a fixed boiling point.
5. No heat or light is released when air is prepared by mixing of gases.
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Answer 2

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♻Һ૯Ր૯ ɿς ע૦υՐ คՈςω૯Ր♻
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✴Aɪʀ ɪꜱ ᴀ ᴍɪxᴛᴜʀᴇ ʙᴇᴄᴀᴜꜱᴇ:-

[1] Iᴛ'ꜱ ᴄᴏᴍᴘᴏɴᴇɴᴛ ᴠᴀʀʏ ғʀᴏᴍ ᴘʟᴀᴄᴇ ᴛᴏ ᴘʟᴀᴄᴇ.

[2] Iᴛ'ꜱ ᴄᴏᴍᴘᴏɴᴇɴᴛ ᴄᴀɴ ʙᴇ ꜱᴇᴘᴀʀᴀᴛᴇᴅ ʙʏ ᴘʜʏꜱɪᴄᴀʟ ᴍᴇᴀɴꜱ.

[3] Iᴛ ꜱʜᴏᴡ ᴛʜᴇ ᴘʀᴏᴘᴇʀᴛʏ ᴏғ ᴀʟʟ ᴛʜᴇ ɢᴀꜱᴇꜱ ᴛʜᴀᴛ ᴘʀᴇꜱᴇɴᴛꜱ ɪɴ ᴀᴛᴍᴏꜱᴘʜᴇʀᴇ.

[4] Iᴛ ᴅᴏᴇꜱɴ'ᴛ ʜᴀᴠᴇ ᴀ ғɪxᴇᴅ ғᴏʀᴍᴜʟᴀ.

[5] Iᴛ ᴅᴏᴇꜱ ʜᴀᴠᴇ ᴀ ғɪxᴇᴅ ᴄᴏᴍᴘᴏꜱɪᴛɪᴏɴ.