Chapter 18, Problem 40CQ

Summary Introduction

To explain: The way in which chemical reducing agents and molasses or cooking oil promote reduction of Cr(VI) to Cr(III).

Concept introduction: Chromium exists in two states Cr(III) and Cr(IV) of which Cr(III) I is non-toxic. But in underground water, Cr (IV) is high due to erosion and other reasons. The rate of respiration of microbes is used as a part of bioremediation to reduce the toxicity of chromium.