Chapter 20, Problem 20QRT

(a)

Interpretation Introduction

Interpretation:

Balanced equation representing ${\text{Cu}}_{\text{2}}\text{S}$ converted to copper metal by roasting has to be written.

Concept Introduction:

Chemical reaction can be represented by means of a chemical equation.  In a chemical equation, the atomic symbols of the elements are to represent the reactants and products.  Balanced chemical equation is the one that has same number of same type of atoms equal on both sides of the equation.

(b)

Interpretation Introduction

Interpretation:

Balanced equation representing ${\text{Fe}}_{\text{2}}{\text{O}}_{\text{3}}$ reduced with aluminium has to be written.

Concept Introduction:

Refer part (a).