Consider I Cr(III) generally has lower aqueous solubility/soil mobility than Cr(VI);II Zero-valent iron converts Cr(III) to Cr(VI);III Cr(VI) is carcinogenic;IV Cr(III) is more toxic than Cr(VI).
Cr(VI) commonly occurs as mobile oxyanions and is a known carcinogenic form. Cr(III) is generally less mobile and less toxic in the intended environmental comparison. Zero-valent iron is a reducing agent used to convert Cr(VI) toward Cr(III),the reverse of II. Thus **I, III true;II, IV false, C**.
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