Embibe Experts Solutions for Chapter: Metals and Non-Metals, Exercise 1: Karnataka Board-2019

Draw the diagram of an electrolytic cell used in the purification of copper and label the electrode having impure copper. 

Observe the following chemical equations:

(i) ${\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{NaOH}\to 2{\mathrm{NaAlO}}_2+{\mathrm{H}}_2\mathrm{O}$

(ii) ${\mathrm{Al}}_2{\mathrm{O}}_3+6\mathrm{HCl}\to 2{\mathrm{AlCl}}_3+3{\mathrm{H}}_2\mathrm{O}$

What is the conclusion that you take about the nature of aluminium oxide with the help of these equations? Give a reason for your conclusion.

Molten cryolite is mixed with molten alumina in the extraction of aluminium by electrolysis. Why? Name the substances that are used as anode and cathode in this method. 

What is roasting in metallurgy?

What are amphoteric oxides?

Draw the diagram of the arrangement of apparatus to show that acid solution in water conducts electricity and label the battery. 

Draw the diagram of the apparatus used in the refining of copper sulphate solution. Label the cathode.

Draw the diagram of the apparatus used in the refining of copper sulphate solution. Label the anode mud.