Bessemerisation is carried out for:
$I$: $Fe$
$II$: $Cu$
$III$: $Al$
$IV$: Silver

To obtain steel entirely free from sulphur and phosphorus,the process used is

Select the incorrect statement.

Among statements $(a)-(d),$ the correct ones are
$(a)$ Limestone is decomposed to $CaO$ during the extraction of iron from its oxides.
$(b)$ In the extraction of silver,silver is extracted as an anionic complex.
$(c)$ Nickel is purified by Mond's process.
$(d)$ $Zr$ and $Ti$ are purified by Van Arkel method.

What is the approximate ratio of roasted ore,coke and limestone respectively in the charge to be added into the blast furnace for the extraction of iron?

Write the uses of alloys.