71.

Name the following:
The process of coating of iron with zinc.

Name the following:
An alloy of lead and tin that is used in electrical circuits.

Name the following:
An ore of zinc containing its sulphide.

Answer the following questions with respect to the electrolytic process in the extraction of aluminium:
Identify the components of the electrolyte other than pure alumina and the role played by each.

Answer the following questions with respect to the electrolytic process in the extraction of aluminium:
Explain why powdered coke is sprinkled over the electrolytic mixture.

Complete the following by selecting the correct option from the choices given:

The metal which does not react with water or dilute H₂SO₄ but reacts with
concentrated H₂SO₄ is _________. (Al/Cu/Zn/Fe)

Complete the following by selecting the correct option from the choices given:
The metal whose oxide, which is amphoteric, is reduced to metal by carbon
reduction ____________. (Fe/Mg/Pb/Al)

The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is __________. (Al/Na/Mg/K)