Question

An ore on treatment with dilute hcl produces brisk effervescence what type of ore is this? What stepa will be required to obtain metal from enriched ore?

Answer 1

Carbonate ores on reacting with HCl give brisk effervescence(liberating CO2)

So the method of calcination is used.

Let’s take ZnCO3 for example

Step 1: it needs to be heated in the absence of oxygen

ZnCO3 ——> ZnO + CO2

Step 2: this oxide is then reducing a reducing agent like carbon

ZnO + C —> Zn + CO