Question

An ore on treatment with dilute hydrochloric acid produces brisk effervescence. What type of ore is this? What steps will be required to obtain metal from the enriched ore?

Answer 1

The type of ore is "Carbonate Ore"

Steps required to obtain pure metal from this are:
1)Calcination, to obtain oxide of the metal.
2)Reduction,reacting the oxide of the metal with carbon monoxide.
3)thus pure metal will be obtained.

For Example:
Consider the ore to be zinc Carbonate.

Steps for obtaining pure metal:
1)zinc carbonate ---(heated in absence----Zinc Oxide + carbon dioxide
                                    of oxygen)

2) zinc oxide + carbon monoxide --------      Zinc     +    carbon dioxide
                                                              (pure metal)

Answer 2

Ans is carbonate ore

1.calcination: -carbonate ore is heated in limited supply of air and oxide is obtained, e.g.

ZnCo3(s) ---------->Zn(s) + Co2

2.reduction with carbon: -oxide ore is heated with carbon. E. g.: -

Cu(s) +2AgNo3(aq) ----->CUNO3(aq) +2Ag(s)...