Tag: study of kerala

Coke, limestone flux, and iron ore are charged into the top of the furnace in a precise filling order which helps control gas flow and the chemical reactions inside the furnace. Hence, The flux used in the extraction of iron is limestone. 

In blast furnace, products are collected at bottom. So, molten metal should be at bottom and slag is at up. So slag should have low density compared to molten metal.

Zinc Sulphide and Calamine responds for the process because, in $ZnS$, only zinc comes at smelting and after process, high purity comes after distillation. similar to Calamine, after distillation, the metal obtained is pure.

Gold is less reactive element. In electrochemical series, it is lower than Hydrogen. It doesn't react with anything. So it occurs as native metal.

The principle ore of copper is copper pyrite $(CuFeS _2)$ and copper is extracted from this ore. 

Slag is the fusible compound formed by the combination of flux and gangue.

$\underset{Flux}{CaO}+\underset{Gangue}{SiO _2} \rightarrow \underset{Slag}{CaSiO _3}$

At the temperature of the slag zone in the metallurgy of iron using blast furnace is $800^oC – 1000^oC$.

Option (C) is correct.

Hand picking is effective in solid mixtures as the impurities, that we want to separate are visible to eye.

Gold and silver are extracted from their native ores by leaching. Leaching involves the treatment of the ore with suitable reagent as to make it soluble while impurities remain insoluble.

Iron, Nickel, Chromium