Embibe Experts Solutions for Chapter: General Principles and Processes of Isolation of Metals (Metallurgy), Exercise 1: EXERCISE-1

Among the following statements, the incorrect one is

$\left(\mathrm{Ag}+\mathrm{Pb}\right) \mathrm{alloy}\stackrel{\mathrm{Melt} \mathrm{and} \mathrm{add} \mathrm{zinc}}{\to }\left(\mathrm{Ag}+\mathrm{Pb}+\mathrm{Zn}\right) \mathrm{melt}\stackrel{\mathrm{Cool}}{\to }\boxed{\frac{\mathrm{Layer} \mathrm{X}}{\mathrm{Layer} \mathrm{Y}}}$

Select correct statement based on above scheme:

Bessemerisation is carried out for

(i) $\mathrm{Fe}$

(ii) $\mathrm{Cu}$

(iii) $\mathrm{Al}$

(iv) silver

Consider the following statements:

Roasting is carried out to:

(i) convert sulphide to oxide and sulphate

(ii) remove water of hydration

(iii) melt the ore

(iv) remove arsenic and sulphur impurities

Of these statements:

There are following extraction process of silver but not:

Identify the process to which the following reaction belongs:

${\mathrm{Al}}_2{\mathrm{O}}_3.2{\mathrm{H}}_2\mathrm{O}+{\mathrm{Na}}_2{\mathrm{CO}}_3\to 2{\mathrm{NaAlO}}_2+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2$

$2{\mathrm{NaAlO}}_2+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2\stackrel{50-60 °\mathrm{C}}{\to }{\mathrm{Al}}_2{\mathrm{O}}_3.2{\mathrm{H}}_2\mathrm{O}+{\mathrm{Na}}_2{\mathrm{CO}}_3$

Formation of metallic copper from the sulphide ore in the normal thermo-metallurgical process essentially involves which one of the following reaction:

$\mathrm{Pb}$ and $\mathrm{Sn}$ extracted from their chief ore by: