Question

11. Explain why aluminum cannot be obtained by the reduction of its oxide with carbon.
12. What is the function of cryolite in the extraction of Al, other than as a solvent for bauxite?
13. What are the special features of each of the following?
a. Duralumin
b. type metal
14. By which chemical process are the impurities present in the iron obtained from blast
furnace removed during making of steel?
15. Which substance is added to steel to make stainless steel?
16. Zinc blend, when roasted in air, gives off a gas which, if allowed to escape, would constitute
an atmospheric pollutant. What is this gas?
17. A man went door to door posing as a goldsmith. He promised to bring back the glitter of old
and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him, which he
dipped in a particular solution. The bangles sparkled like newbut their weight was reduced
drastically. The lady was upset but, after a futile argument, the man beat a hasty retreat. Can
you play the detective to find out the nature of the solution he hadused?
18. Give reasons why Cu is used to make hot water tanks and not steel.​

Answer 1

aluminium cannot be obtained by its oxides reactions with carbon this is because Aluminium is more reactive than carbons that is so it cannot be reduced from Aluminium oxide to aluminium in case of carbon .so in this case idea to metal then aluminium can be used to reduce Aluminium oxide to aluminium