(A) In $1774$,the scientist $Carl \ Wilhem \ Scheele$ discovered chlorine gas by the action of $HCl$ on $MnO_2$.However,at that time,he believed it wa

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(A) In $1774$,the scientist $Carl \ Wilhem \ Scheele$ discovered chlorine gas by the action of $HCl$ on $MnO_2$.However,at that time,he believed it was a compound containing oxygen.It was $Humphry \ Davy$ who later identified chlorine as an element in $1810$ and named it chlorine due to its greenish-yellow color.