In Hall - Heroult process, the following is used for reducing $$\mathrm{Al}_{2} \mathrm{O}_{3}$$ :-

Given below are two statements:

Statement I : In redox titration, the indicators used are sensitive to change in $$\mathrm{pH}$$ of the solution.

Statement II : In acid-base titration, the indicators used are sensitive to change in oxidation potential.

In the light of the above statements, choose the most appropriate answer from the options given below

For a good quality cement, the ratio of lime to the total of the oxides of $$\mathrm{Si}, \mathrm{Al}$$ and $\mathrm{Fe}$ should be as close as to :

The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous $$\mathrm{NaOH}$$ is :

Choose the correct answer from the options given below: