Question

An ore on treatment with dilute hydrochloric acid produces brisk effervescence to produce a colorless and odourless gas . What type of ore is this? What operation will be required to obtain metal from it?

Answer 1

It is a carbonate ore because it produce CO2 with brisk effervescence.
It should be first calciniced and then reduced to obtain metal

Answer 2

Answer : The type of ore is, carbonate ore. The operation required to obtained metal from it will be, calcination process.

Explanation :

When an ore on the treatment with the dilute hydrochloric acid produces brisk effervescence to produce a colorless and odorless gas then the ore should be carbonate ore. The operation required to obtained metal from it will be, calcination process.

Calcination process : When the metal carbonate on treatment with the dilute hydrochloric acid, it releases carbon dioxide as a colorless and odorless gas with brisk effervescence. Hence, by the calcination process the metal carbonate ore are converted to their metal oxides.

The reactions involved are :

(1) The metal carbonate ore on heating gives metal oxide and carbon dioxide.

$ZnCO_3(S)\overset{\Delta}\rightarrow ZnO(s)+CO_2(g)$

(2) The reduction of metal oxide with the carbon to give metal and carbon monoxide as a gas.

$ZnO(s)+C(s)\overset{\Delta}\rightarrow Zn(s)_CO(g)$