   Chapter 22, Problem 18PS

Chapter
Section
Textbook Problem

Lime (CaO) is usually added to the blast furnace in the metallurgy of iron where it reacts with impurities present in iron ore. What of the following best describes its function?(a) CaO acts as an oxidizing agent.(b) CaO acts as a reducing agent.(c) CaO acts as an acid.(d) CaO acts as a base.

Interpretation Introduction

Interpretation: The function of CaO in the metallurgy of iron where it reacts with impurities present in the iron ores has to be determined.

Concept introduction:

Pyrometallurgy is a method used for extracting and purifying metals using high temperature. It is used in the production of iron. Carbon and carbon monoxide are commonly used reducing agents in pyrometallurgy of iron to get impure iron metal. Iron ores contain impurities like silicon dioxide. Lime is added to remove theses impurities.

Explanation

Reason for correct option

Pyrometallurgy is a method used for extracting and purifying metals using high temperature. It is used in the production of iron. Carbon and carbon monoxide are commonly used reducing agents in pyrometallurgy of iron to get impure iron metal.

Iron ores contain impurities like silicon dioxide. Lime is added to remove theses impurities. Lime reacts with silicon mineral and forms calcium silicate called slag. Here, silicon dioxide is an acid whereas CaO is base oxide and hence an acid-base reaction is involved between SiO2 and CaO

The function of CaO in the metallurgy of iron is to act as a base where it reacts with impurities present in the iron ores

Hence the correct option for element which got oxidized and which got reduced in the given reaction is option d.

Reasons for incorrect options:

Write all the functions of CaO in the metallurgy of iron where it reacts with impurities present in the iron ores given in the options except option d

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