JEE Main · 2019 · 09 Jan 2019 · Shift 1 · General Principles and Processes of Isolation of Metals

The molar mass of the water insoluble product formed from the fusion of chromite ore $\left({\mathrm{FeCr}}_2{\mathrm{O}}_4\right)$ with ${\mathrm{Na}}_2{\mathrm{CO}}_3$ in presence of ${\mathrm{O}}_2$ is ______ $\mathrm{g}{\mathrm{mol}}^{-1}$.

In Hall - Heroult process, the following is used for reducing ${\mathrm{Al}}_2{\mathrm{O}}_3$ :-

Which of the following metals can be extracted through alkali leaching technique?

Which of the following is used as a stabilizer during the concentration of sulphide ores?

In the extraction process of copper, the product obtained after carrying out the reactions
(i) $2{\mathrm{Cu}}_2\mathrm{S}+3{\mathrm{O}}_2\to 2{\mathrm{Cu}}_2\mathrm{O}+2{\mathrm{SO}}_2$
(ii) …

Given below are two statements :

Statement-I : In the metallurgy process, sulphide ore is converted to oxide before reduction.

Statement-II : Oxide ores in general are easier to reduce.

In the light of the above statements, choose the most appropriate answer from the options g …