onions contain sulphuric acid which causes tears when we cut them. the tears produced is how the body washes it away from the eyes.
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The acid gets mixed with enzymes and forms a gas called propanethiol S-oxide. ... - The unstable sulfenic acidrearranges itself into syn-ropanethial-S-oxide. - Syn-propanethial-S-oxide gets into the air and comes in contact with our eyes. The lachrymal glands in our eyes become irritated andproduces tears!
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