Question

why does ZnO become yellow upon heating.​

Answer 1

HolaMate♥

Wʜᴇɴ yᴏᴜ ʜᴇᴀᴛ ZnO ᴛʜᴇɴ ᴏxyɢᴇɴ ʟᴇᴀᴠᴇꜱ ᴀꜱ O2 ʙᴇʜɪɴᴅ Zn+2 ᴀɴᴅ ᴛᴡᴏ ᴇʟᴇᴄᴛʀᴏɴꜱ. Zn+2 ᴀɴᴅ ᴛʜᴇ ᴛᴡᴏ ᴇʟᴇᴄᴛʀᴏɴꜱ ᴍᴏᴠᴇ ᴛᴏ ᴛʜᴇ ɪɴᴛᴇʀꜱᴛɪᴛɪᴀʟ ꜱɪᴛᴇꜱ ᴏꜰ ᴛʜᴇ ᴄʀyꜱᴛᴀʟꜱ.

ᴡʜᴇɴ ʟɪɢʜᴛ ꜰᴀʟʟꜱ ᴏɴ ᴛʜᴇꜱᴇ ᴄʀyꜱᴛᴀʟꜱ ᴛʜᴇɴ ᴛʜᴇꜱᴇ ᴇʟᴇᴄᴛʀᴏɴꜱ ᴀʙꜱᴏʀʙ ᴀ ᴩᴀʀᴛ ᴏꜰ ᴀ ʟɪɢʜᴛ ɪɴ ᴛʜᴇ ᴠɪꜱɪʙʟᴇ ʀᴇɢɪᴏɴ ᴀɴᴅ ᴛʜᴇɴ ᴛʜᴇy ꜱʜᴏᴡ yᴇʟʟᴏᴡ ᴄᴏʟᴏʀ ᴛᴏ ᴛʜᴇ ZnO.....

i hope it will helps you❤

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Answer 2

$<b>$Hello CHINNU ☺_/\_

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♣→In ZnO, Zn2+ ions occupy the interstitial sites and electrons are trapped in the interstitial sites for the neutralization.

♣→Crystals that shows such type of defects are generally colored.

♣→Zinc oxide is white in color but on heating it turns into yellow because on heating it loses oxygen reversibly at high temperature.

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I hope, this will be helpful for you ☺

thank you^_^

$\bold\pink{tera\:yar\:hoon\:mein}$

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