(N/A) RoastingCalcination$1.$ In this,the ore is heated in the presence of excess air.$1.$ In this,the ore is heated in the absence or limited supply

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(N/A) RoastingCalcination$1.$ In this,the ore is heated in the presence of excess air.$1.$ In this,the ore is heated in the absence or limited supply of air.$2.$ It is primarily done for sulphide ores.$2.$ It is primarily done for carbonate ores.$3.$ $SO_2$ gas is evolved.$3.$ $CO_2$ gas is evolved.$4.$ Example: $2ZnS + 3O_2 \xrightarrow{\text{heat}} 2ZnO + 2SO_2$$4.$ Example: $ZnCO_3 \xrightarrow{\text{heat}} ZnO + CO_2$

Class 10 Science Metals and Non-metals Mix Examples - Metals and Non-metals

Medium

Differentiate between roasting and calcination and give examples.

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Solution

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Roasting	Calcination
$1.$ In this,the ore is heated in the presence of excess air.	$1.$ In this,the ore is heated in the absence or limited supply of air.
$2.$ It is primarily done for sulphide ores.	$2.$ It is primarily done for carbonate ores.
$3.$ $SO_2$ gas is evolved.	$3.$ $CO_2$ gas is evolved.
$4.$ Example: $2ZnS + 3O_2 \xrightarrow{\text{heat}} 2ZnO + 2SO_2$	$4.$ Example: $ZnCO_3 \xrightarrow{\text{heat}} ZnO + CO_2$