Question

what is the reason for tear while cutting onion

Answer 1

We tend to cry while we cut the onions as the onions consists of sulphur

Answer 2

The reason for tear in eyes while cutting onion is that it releases a gas called propanothiol S-oxide,when mixed with certain enzymes in onion it forms sulpher.
And when sulpher gets into our eyes it makes mild acid which make us cry.
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