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Why does leather get hardened after tann...

Why does leather get hardened after tanning?

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(a) For answer, consult section 27.
(b) For answer, consult section 17.
(c ) Co is a poisonous gas and acts as poison for the catalyst finely divided platinum in haber's process. Therefore, it has to be removed before passing the gaseous mixture `(N_(2)and H_(2))` through the catalyst.
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