Metals of the first transition series have special properties which are different from those of groups I and II elements because they have partially filled?

Chlorine gas is prepared in the laboratory by?

A. adding concentrated hydrochloric acid to solid manganese (IV) oxide B. adding concentrated tetraoxosulphate (VI) acid to solid sodium chloride C. dropping concentrated hydrochloric acid onto potassium tetraoxomanganate (VI) crystals D. adding concentrated...

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