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...

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

Which one of the following elements will remain as liquid inside pure boiling water?

During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will...

Which of the following elements have half-filled f-orbitals in their ground state ?
(Given : atomic number Sm = 62; Eu = 63; Tb =...

Which one of the following statements is incorrect ?

Consider the following equation : $$ 2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_3(\mathrm{~g}), \Delta \mathrm{H}=-190 \mathrm{~kJ} $$ The number of factors which will increase the vield of...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Cu2+ in...

$\mathrm{KMnO}_4$ oxidises I- in acidic and neutral/faintly alkaline solution, respectively to

A solution of $\mathrm{CrO}_5$ in amyl alcohol has a $\_\_\_\_$ colour