23. (0) How are metalloids different from metals? Name a metalloid.
(ii) Differentiate between the roasting and calcinations processes used in
metallurgy Give an example of each
Answers
Answer:
Metalloids are also called semi-metals have properties of of both metals and non-metal.There are 7 Metalloids inthe periodic table
EX: Boron,Silicon,Germanium,Arsenic,Antimony,Tellurium and polonium
ROASTING: The ore is heated in the excess of air
Generally sulphide ores are roasted,so SO2 is given off.
CALCINATION:The ore is heated in tje absence of air...
Carbonate and hydrated ores are calcined and CO2 vapours. are given off
HOPE IT HELPS YOU........
Answer:
metalliods are the compounds showing both the properties of mehala as well as non metal .
ln periodic table these are found in the gap drawn between a zig zag line.
calculations and roasting are methods usead for separation of metals from ores
e.g..if the ore is a sulphar then roasting metod is used
roasting is the heating of ore in excess air.
while calcination is used for the carbonated ores .
it's is a process in which the ore is heated in limited air.
hope this might help.
ples make this brainly answer.